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* elf-bfd.h (struct elf_backend_data): Add rela_normal.
[thirdparty/binutils-gdb.git] / bfd / elf64-ppc.c
1 /* PowerPC64-specific support for 64-bit ELF.
2 Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
3 Written by Linus Nordberg, Swox AB <info@swox.com>,
4 based on elf32-ppc.c by Ian Lance Taylor.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22 /* This file is based on the 64-bit PowerPC ELF ABI. It is also based
23 on the file elf32-ppc.c. */
24
25 #include "bfd.h"
26 #include "sysdep.h"
27 #include "bfdlink.h"
28 #include "libbfd.h"
29 #include "elf-bfd.h"
30 #include "elf/ppc.h"
31 #include "elf64-ppc.h"
32
33 #define USE_RELA /* we want RELA relocations, not REL. */
34
35
36 static void ppc_howto_init
37 PARAMS ((void));
38 static reloc_howto_type *ppc64_elf_reloc_type_lookup
39 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
40 static void ppc64_elf_info_to_howto
41 PARAMS ((bfd *abfd, arelent *cache_ptr, Elf64_Internal_Rela *dst));
42 static bfd_reloc_status_type ppc64_elf_ha_reloc
43 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
44 static bfd_reloc_status_type ppc64_elf_brtaken_reloc
45 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
46 static bfd_reloc_status_type ppc64_elf_sectoff_reloc
47 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
48 static bfd_reloc_status_type ppc64_elf_sectoff_ha_reloc
49 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
50 static bfd_reloc_status_type ppc64_elf_toc_reloc
51 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
52 static bfd_reloc_status_type ppc64_elf_toc_ha_reloc
53 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
54 static bfd_reloc_status_type ppc64_elf_toc64_reloc
55 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
56 static bfd_reloc_status_type ppc64_elf_unhandled_reloc
57 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
58 static boolean ppc64_elf_set_private_flags
59 PARAMS ((bfd *, flagword));
60 static boolean ppc64_elf_merge_private_bfd_data
61 PARAMS ((bfd *, bfd *));
62 static boolean ppc64_elf_section_from_shdr
63 PARAMS ((bfd *, Elf64_Internal_Shdr *, char *));
64
65
66 /* Mask to set RA in memory instructions. */
67 #define RA_REGISTER_MASK 0x001f0000
68
69 /* Value to shift register by to insert RA. */
70 #define RA_REGISTER_SHIFT 16
71
72 /* The name of the dynamic interpreter. This is put in the .interp
73 section. */
74 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
75
76 /* The size in bytes of an entry in the procedure linkage table. */
77 #define PLT_ENTRY_SIZE 24
78
79 /* The initial size of the plt reserved for the dynamic linker. */
80 #define PLT_INITIAL_ENTRY_SIZE PLT_ENTRY_SIZE
81
82 /* TOC base pointers offset from start of TOC. */
83 #define TOC_BASE_OFF (0x8000)
84
85 /* .plt call stub instructions. */
86 #define ADDIS_R12_R2 0x3d820000 /* addis %r12,%r2,xxx@ha */
87 #define STD_R2_40R1 0xf8410028 /* std %r2,40(%r1) */
88 #define LD_R11_0R12 0xe96c0000 /* ld %r11,xxx+0@l(%r12) */
89 #define LD_R2_0R12 0xe84c0000 /* ld %r2,xxx+8@l(%r12) */
90 #define MTCTR_R11 0x7d6903a6 /* mtctr %r11 */
91 /* ld %r11,xxx+16@l(%r12) */
92 #define BCTR 0x4e800420 /* bctr */
93
94 /* The normal stub is this size. */
95 #define PLT_CALL_STUB_SIZE (7*4)
96
97 /* But sometimes the .plt entry crosses a 64k boundary, and we need
98 to adjust the high word with this insn. */
99 #define ADDIS_R12_R12_1 0x3d8c0001 /* addis %r12,%r12,1 */
100
101 /* The .glink fixup call stub is the same as the .plt call stub, but
102 the first instruction restores r2, and the std is omitted. */
103 #define LD_R2_40R1 0xe8410028 /* ld %r2,40(%r1) */
104
105 /* Always allow this much space. */
106 #define GLINK_CALL_STUB_SIZE (8*4)
107
108 /* Pad with this. */
109 #define NOP 0x60000000
110
111 /* Some other nops. */
112 #define CROR_151515 0x4def7b82
113 #define CROR_313131 0x4ffffb82
114
115 /* .glink entries for the first 32k functions are two instructions. */
116 #define LI_R0_0 0x38000000 /* li %r0,0 */
117 #define B_DOT 0x48000000 /* b . */
118
119 /* After that, we need two instructions to load the index, followed by
120 a branch. */
121 #define LIS_R0_0 0x3c000000 /* lis %r0,0 */
122 #define ORI_R0_R0_0 0x60000000 /* ori %r0,%r0,0 */
123
124 /* Instructions to save and restore floating point regs. */
125 #define STFD_FR0_0R1 0xd8010000 /* stfd %fr0,0(%r1) */
126 #define LFD_FR0_0R1 0xc8010000 /* lfd %fr0,0(%r1) */
127 #define BLR 0x4e800020 /* blr */
128
129 /* Since .opd is an array of descriptors and each entry will end up
130 with identical R_PPC64_RELATIVE relocs, there is really no need to
131 propagate .opd relocs; The dynamic linker should be taught to
132 relocate .opd without reloc entries. FIXME: .opd should be trimmed
133 of unused values. */
134 #ifndef NO_OPD_RELOCS
135 #define NO_OPD_RELOCS 0
136 #endif
137 \f
138 /* Relocation HOWTO's. */
139 static reloc_howto_type *ppc64_elf_howto_table[(int) R_PPC_max];
140
141 static reloc_howto_type ppc64_elf_howto_raw[] = {
142 /* This reloc does nothing. */
143 HOWTO (R_PPC64_NONE, /* type */
144 0, /* rightshift */
145 2, /* size (0 = byte, 1 = short, 2 = long) */
146 32, /* bitsize */
147 false, /* pc_relative */
148 0, /* bitpos */
149 complain_overflow_bitfield, /* complain_on_overflow */
150 bfd_elf_generic_reloc, /* special_function */
151 "R_PPC64_NONE", /* name */
152 false, /* partial_inplace */
153 0, /* src_mask */
154 0, /* dst_mask */
155 false), /* pcrel_offset */
156
157 /* A standard 32 bit relocation. */
158 HOWTO (R_PPC64_ADDR32, /* type */
159 0, /* rightshift */
160 2, /* size (0 = byte, 1 = short, 2 = long) */
161 32, /* bitsize */
162 false, /* pc_relative */
163 0, /* bitpos */
164 complain_overflow_bitfield, /* complain_on_overflow */
165 bfd_elf_generic_reloc, /* special_function */
166 "R_PPC64_ADDR32", /* name */
167 false, /* partial_inplace */
168 0, /* src_mask */
169 0xffffffff, /* dst_mask */
170 false), /* pcrel_offset */
171
172 /* An absolute 26 bit branch; the lower two bits must be zero.
173 FIXME: we don't check that, we just clear them. */
174 HOWTO (R_PPC64_ADDR24, /* type */
175 0, /* rightshift */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
177 26, /* bitsize */
178 false, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_bitfield, /* complain_on_overflow */
181 bfd_elf_generic_reloc, /* special_function */
182 "R_PPC64_ADDR24", /* name */
183 false, /* partial_inplace */
184 0, /* src_mask */
185 0x3fffffc, /* dst_mask */
186 false), /* pcrel_offset */
187
188 /* A standard 16 bit relocation. */
189 HOWTO (R_PPC64_ADDR16, /* type */
190 0, /* rightshift */
191 1, /* size (0 = byte, 1 = short, 2 = long) */
192 16, /* bitsize */
193 false, /* pc_relative */
194 0, /* bitpos */
195 complain_overflow_bitfield, /* complain_on_overflow */
196 bfd_elf_generic_reloc, /* special_function */
197 "R_PPC64_ADDR16", /* name */
198 false, /* partial_inplace */
199 0, /* src_mask */
200 0xffff, /* dst_mask */
201 false), /* pcrel_offset */
202
203 /* A 16 bit relocation without overflow. */
204 HOWTO (R_PPC64_ADDR16_LO, /* type */
205 0, /* rightshift */
206 1, /* size (0 = byte, 1 = short, 2 = long) */
207 16, /* bitsize */
208 false, /* pc_relative */
209 0, /* bitpos */
210 complain_overflow_dont,/* complain_on_overflow */
211 bfd_elf_generic_reloc, /* special_function */
212 "R_PPC64_ADDR16_LO", /* name */
213 false, /* partial_inplace */
214 0, /* src_mask */
215 0xffff, /* dst_mask */
216 false), /* pcrel_offset */
217
218 /* Bits 16-31 of an address. */
219 HOWTO (R_PPC64_ADDR16_HI, /* type */
220 16, /* rightshift */
221 1, /* size (0 = byte, 1 = short, 2 = long) */
222 16, /* bitsize */
223 false, /* pc_relative */
224 0, /* bitpos */
225 complain_overflow_dont, /* complain_on_overflow */
226 bfd_elf_generic_reloc, /* special_function */
227 "R_PPC64_ADDR16_HI", /* name */
228 false, /* partial_inplace */
229 0, /* src_mask */
230 0xffff, /* dst_mask */
231 false), /* pcrel_offset */
232
233 /* Bits 16-31 of an address, plus 1 if the contents of the low 16
234 bits, treated as a signed number, is negative. */
235 HOWTO (R_PPC64_ADDR16_HA, /* type */
236 16, /* rightshift */
237 1, /* size (0 = byte, 1 = short, 2 = long) */
238 16, /* bitsize */
239 false, /* pc_relative */
240 0, /* bitpos */
241 complain_overflow_dont, /* complain_on_overflow */
242 ppc64_elf_ha_reloc, /* special_function */
243 "R_PPC64_ADDR16_HA", /* name */
244 false, /* partial_inplace */
245 0, /* src_mask */
246 0xffff, /* dst_mask */
247 false), /* pcrel_offset */
248
249 /* An absolute 16 bit branch; the lower two bits must be zero.
250 FIXME: we don't check that, we just clear them. */
251 HOWTO (R_PPC64_ADDR14, /* type */
252 0, /* rightshift */
253 2, /* size (0 = byte, 1 = short, 2 = long) */
254 16, /* bitsize */
255 false, /* pc_relative */
256 0, /* bitpos */
257 complain_overflow_bitfield, /* complain_on_overflow */
258 bfd_elf_generic_reloc, /* special_function */
259 "R_PPC64_ADDR14", /* name */
260 false, /* partial_inplace */
261 0, /* src_mask */
262 0xfffc, /* dst_mask */
263 false), /* pcrel_offset */
264
265 /* An absolute 16 bit branch, for which bit 10 should be set to
266 indicate that the branch is expected to be taken. The lower two
267 bits must be zero. */
268 HOWTO (R_PPC64_ADDR14_BRTAKEN, /* type */
269 0, /* rightshift */
270 2, /* size (0 = byte, 1 = short, 2 = long) */
271 16, /* bitsize */
272 false, /* pc_relative */
273 0, /* bitpos */
274 complain_overflow_bitfield, /* complain_on_overflow */
275 ppc64_elf_brtaken_reloc, /* special_function */
276 "R_PPC64_ADDR14_BRTAKEN",/* name */
277 false, /* partial_inplace */
278 0, /* src_mask */
279 0xfffc, /* dst_mask */
280 false), /* pcrel_offset */
281
282 /* An absolute 16 bit branch, for which bit 10 should be set to
283 indicate that the branch is not expected to be taken. The lower
284 two bits must be zero. */
285 HOWTO (R_PPC64_ADDR14_BRNTAKEN, /* type */
286 0, /* rightshift */
287 2, /* size (0 = byte, 1 = short, 2 = long) */
288 16, /* bitsize */
289 false, /* pc_relative */
290 0, /* bitpos */
291 complain_overflow_bitfield, /* complain_on_overflow */
292 ppc64_elf_brtaken_reloc, /* special_function */
293 "R_PPC64_ADDR14_BRNTAKEN",/* name */
294 false, /* partial_inplace */
295 0, /* src_mask */
296 0xfffc, /* dst_mask */
297 false), /* pcrel_offset */
298
299 /* A relative 26 bit branch; the lower two bits must be zero. */
300 HOWTO (R_PPC64_REL24, /* type */
301 0, /* rightshift */
302 2, /* size (0 = byte, 1 = short, 2 = long) */
303 26, /* bitsize */
304 true, /* pc_relative */
305 0, /* bitpos */
306 complain_overflow_signed, /* complain_on_overflow */
307 bfd_elf_generic_reloc, /* special_function */
308 "R_PPC64_REL24", /* name */
309 false, /* partial_inplace */
310 0, /* src_mask */
311 0x3fffffc, /* dst_mask */
312 true), /* pcrel_offset */
313
314 /* A relative 16 bit branch; the lower two bits must be zero. */
315 HOWTO (R_PPC64_REL14, /* type */
316 0, /* rightshift */
317 2, /* size (0 = byte, 1 = short, 2 = long) */
318 16, /* bitsize */
319 true, /* pc_relative */
320 0, /* bitpos */
321 complain_overflow_signed, /* complain_on_overflow */
322 bfd_elf_generic_reloc, /* special_function */
323 "R_PPC64_REL14", /* name */
324 false, /* partial_inplace */
325 0, /* src_mask */
326 0xfffc, /* dst_mask */
327 true), /* pcrel_offset */
328
329 /* A relative 16 bit branch. Bit 10 should be set to indicate that
330 the branch is expected to be taken. The lower two bits must be
331 zero. */
332 HOWTO (R_PPC64_REL14_BRTAKEN, /* type */
333 0, /* rightshift */
334 2, /* size (0 = byte, 1 = short, 2 = long) */
335 16, /* bitsize */
336 true, /* pc_relative */
337 0, /* bitpos */
338 complain_overflow_signed, /* complain_on_overflow */
339 ppc64_elf_brtaken_reloc, /* special_function */
340 "R_PPC64_REL14_BRTAKEN", /* name */
341 false, /* partial_inplace */
342 0, /* src_mask */
343 0xfffc, /* dst_mask */
344 true), /* pcrel_offset */
345
346 /* A relative 16 bit branch. Bit 10 should be set to indicate that
347 the branch is not expected to be taken. The lower two bits must
348 be zero. */
349 HOWTO (R_PPC64_REL14_BRNTAKEN, /* type */
350 0, /* rightshift */
351 2, /* size (0 = byte, 1 = short, 2 = long) */
352 16, /* bitsize */
353 true, /* pc_relative */
354 0, /* bitpos */
355 complain_overflow_signed, /* complain_on_overflow */
356 ppc64_elf_brtaken_reloc, /* special_function */
357 "R_PPC64_REL14_BRNTAKEN",/* name */
358 false, /* partial_inplace */
359 0, /* src_mask */
360 0xfffc, /* dst_mask */
361 true), /* pcrel_offset */
362
363 /* Like R_PPC64_ADDR16, but referring to the GOT table entry for the
364 symbol. */
365 HOWTO (R_PPC64_GOT16, /* type */
366 0, /* rightshift */
367 1, /* size (0 = byte, 1 = short, 2 = long) */
368 16, /* bitsize */
369 false, /* pc_relative */
370 0, /* bitpos */
371 complain_overflow_signed, /* complain_on_overflow */
372 ppc64_elf_unhandled_reloc, /* special_function */
373 "R_PPC64_GOT16", /* name */
374 false, /* partial_inplace */
375 0, /* src_mask */
376 0xffff, /* dst_mask */
377 false), /* pcrel_offset */
378
379 /* Like R_PPC64_ADDR16_LO, but referring to the GOT table entry for
380 the symbol. */
381 HOWTO (R_PPC64_GOT16_LO, /* type */
382 0, /* rightshift */
383 1, /* size (0 = byte, 1 = short, 2 = long) */
384 16, /* bitsize */
385 false, /* pc_relative */
386 0, /* bitpos */
387 complain_overflow_dont, /* complain_on_overflow */
388 ppc64_elf_unhandled_reloc, /* special_function */
389 "R_PPC64_GOT16_LO", /* name */
390 false, /* partial_inplace */
391 0, /* src_mask */
392 0xffff, /* dst_mask */
393 false), /* pcrel_offset */
394
395 /* Like R_PPC64_ADDR16_HI, but referring to the GOT table entry for
396 the symbol. */
397 HOWTO (R_PPC64_GOT16_HI, /* type */
398 16, /* rightshift */
399 1, /* size (0 = byte, 1 = short, 2 = long) */
400 16, /* bitsize */
401 false, /* pc_relative */
402 0, /* bitpos */
403 complain_overflow_dont,/* complain_on_overflow */
404 ppc64_elf_unhandled_reloc, /* special_function */
405 "R_PPC64_GOT16_HI", /* name */
406 false, /* partial_inplace */
407 0, /* src_mask */
408 0xffff, /* dst_mask */
409 false), /* pcrel_offset */
410
411 /* Like R_PPC64_ADDR16_HA, but referring to the GOT table entry for
412 the symbol. */
413 HOWTO (R_PPC64_GOT16_HA, /* type */
414 16, /* rightshift */
415 1, /* size (0 = byte, 1 = short, 2 = long) */
416 16, /* bitsize */
417 false, /* pc_relative */
418 0, /* bitpos */
419 complain_overflow_dont,/* complain_on_overflow */
420 ppc64_elf_unhandled_reloc, /* special_function */
421 "R_PPC64_GOT16_HA", /* name */
422 false, /* partial_inplace */
423 0, /* src_mask */
424 0xffff, /* dst_mask */
425 false), /* pcrel_offset */
426
427 /* This is used only by the dynamic linker. The symbol should exist
428 both in the object being run and in some shared library. The
429 dynamic linker copies the data addressed by the symbol from the
430 shared library into the object, because the object being
431 run has to have the data at some particular address. */
432 HOWTO (R_PPC64_COPY, /* type */
433 0, /* rightshift */
434 2, /* size (0 = byte, 1 = short, 2 = long) */
435 32, /* bitsize */
436 false, /* pc_relative */
437 0, /* bitpos */
438 complain_overflow_bitfield, /* complain_on_overflow */
439 ppc64_elf_unhandled_reloc, /* special_function */
440 "R_PPC64_COPY", /* name */
441 false, /* partial_inplace */
442 0, /* src_mask */
443 0, /* dst_mask */
444 false), /* pcrel_offset */
445
446 /* Like R_PPC64_ADDR64, but used when setting global offset table
447 entries. */
448 HOWTO (R_PPC64_GLOB_DAT, /* type */
449 0, /* rightshift */
450 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
451 64, /* bitsize */
452 false, /* pc_relative */
453 0, /* bitpos */
454 complain_overflow_dont, /* complain_on_overflow */
455 ppc64_elf_unhandled_reloc, /* special_function */
456 "R_PPC64_GLOB_DAT", /* name */
457 false, /* partial_inplace */
458 0, /* src_mask */
459 0xffffffffffffffff, /* dst_mask */
460 false), /* pcrel_offset */
461
462 /* Created by the link editor. Marks a procedure linkage table
463 entry for a symbol. */
464 HOWTO (R_PPC64_JMP_SLOT, /* type */
465 0, /* rightshift */
466 0, /* size (0 = byte, 1 = short, 2 = long) */
467 0, /* bitsize */
468 false, /* pc_relative */
469 0, /* bitpos */
470 complain_overflow_dont, /* complain_on_overflow */
471 ppc64_elf_unhandled_reloc, /* special_function */
472 "R_PPC64_JMP_SLOT", /* name */
473 false, /* partial_inplace */
474 0, /* src_mask */
475 0, /* dst_mask */
476 false), /* pcrel_offset */
477
478 /* Used only by the dynamic linker. When the object is run, this
479 doubleword64 is set to the load address of the object, plus the
480 addend. */
481 HOWTO (R_PPC64_RELATIVE, /* type */
482 0, /* rightshift */
483 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
484 64, /* bitsize */
485 true, /* pc_relative */
486 0, /* bitpos */
487 complain_overflow_dont, /* complain_on_overflow */
488 bfd_elf_generic_reloc, /* special_function */
489 "R_PPC64_RELATIVE", /* name */
490 false, /* partial_inplace */
491 0, /* src_mask */
492 0xffffffffffffffff, /* dst_mask */
493 true), /* pcrel_offset */
494
495 /* Like R_PPC64_ADDR32, but may be unaligned. */
496 HOWTO (R_PPC64_UADDR32, /* type */
497 0, /* rightshift */
498 2, /* size (0 = byte, 1 = short, 2 = long) */
499 32, /* bitsize */
500 false, /* pc_relative */
501 0, /* bitpos */
502 complain_overflow_bitfield, /* complain_on_overflow */
503 bfd_elf_generic_reloc, /* special_function */
504 "R_PPC64_UADDR32", /* name */
505 false, /* partial_inplace */
506 0, /* src_mask */
507 0xffffffff, /* dst_mask */
508 false), /* pcrel_offset */
509
510 /* Like R_PPC64_ADDR16, but may be unaligned. */
511 HOWTO (R_PPC64_UADDR16, /* type */
512 0, /* rightshift */
513 1, /* size (0 = byte, 1 = short, 2 = long) */
514 16, /* bitsize */
515 false, /* pc_relative */
516 0, /* bitpos */
517 complain_overflow_bitfield, /* complain_on_overflow */
518 bfd_elf_generic_reloc, /* special_function */
519 "R_PPC64_UADDR16", /* name */
520 false, /* partial_inplace */
521 0, /* src_mask */
522 0xffff, /* dst_mask */
523 false), /* pcrel_offset */
524
525 /* 32-bit PC relative. */
526 HOWTO (R_PPC64_REL32, /* type */
527 0, /* rightshift */
528 2, /* size (0 = byte, 1 = short, 2 = long) */
529 32, /* bitsize */
530 true, /* pc_relative */
531 0, /* bitpos */
532 /* FIXME: Verify. Was complain_overflow_bitfield. */
533 complain_overflow_signed, /* complain_on_overflow */
534 bfd_elf_generic_reloc, /* special_function */
535 "R_PPC64_REL32", /* name */
536 false, /* partial_inplace */
537 0, /* src_mask */
538 0xffffffff, /* dst_mask */
539 true), /* pcrel_offset */
540
541 /* 32-bit relocation to the symbol's procedure linkage table. */
542 HOWTO (R_PPC64_PLT32, /* type */
543 0, /* rightshift */
544 2, /* size (0 = byte, 1 = short, 2 = long) */
545 32, /* bitsize */
546 false, /* pc_relative */
547 0, /* bitpos */
548 complain_overflow_bitfield, /* complain_on_overflow */
549 ppc64_elf_unhandled_reloc, /* special_function */
550 "R_PPC64_PLT32", /* name */
551 false, /* partial_inplace */
552 0, /* src_mask */
553 0, /* dst_mask */
554 false), /* pcrel_offset */
555
556 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
557 FIXME: R_PPC64_PLTREL32 not supported. */
558 HOWTO (R_PPC64_PLTREL32, /* type */
559 0, /* rightshift */
560 2, /* size (0 = byte, 1 = short, 2 = long) */
561 32, /* bitsize */
562 true, /* pc_relative */
563 0, /* bitpos */
564 complain_overflow_signed, /* complain_on_overflow */
565 bfd_elf_generic_reloc, /* special_function */
566 "R_PPC64_PLTREL32", /* name */
567 false, /* partial_inplace */
568 0, /* src_mask */
569 0, /* dst_mask */
570 true), /* pcrel_offset */
571
572 /* Like R_PPC64_ADDR16_LO, but referring to the PLT table entry for
573 the symbol. */
574 HOWTO (R_PPC64_PLT16_LO, /* type */
575 0, /* rightshift */
576 1, /* size (0 = byte, 1 = short, 2 = long) */
577 16, /* bitsize */
578 false, /* pc_relative */
579 0, /* bitpos */
580 complain_overflow_dont, /* complain_on_overflow */
581 ppc64_elf_unhandled_reloc, /* special_function */
582 "R_PPC64_PLT16_LO", /* name */
583 false, /* partial_inplace */
584 0, /* src_mask */
585 0xffff, /* dst_mask */
586 false), /* pcrel_offset */
587
588 /* Like R_PPC64_ADDR16_HI, but referring to the PLT table entry for
589 the symbol. */
590 HOWTO (R_PPC64_PLT16_HI, /* type */
591 16, /* rightshift */
592 1, /* size (0 = byte, 1 = short, 2 = long) */
593 16, /* bitsize */
594 false, /* pc_relative */
595 0, /* bitpos */
596 complain_overflow_dont, /* complain_on_overflow */
597 ppc64_elf_unhandled_reloc, /* special_function */
598 "R_PPC64_PLT16_HI", /* name */
599 false, /* partial_inplace */
600 0, /* src_mask */
601 0xffff, /* dst_mask */
602 false), /* pcrel_offset */
603
604 /* Like R_PPC64_ADDR16_HA, but referring to the PLT table entry for
605 the symbol. */
606 HOWTO (R_PPC64_PLT16_HA, /* type */
607 16, /* rightshift */
608 1, /* size (0 = byte, 1 = short, 2 = long) */
609 16, /* bitsize */
610 false, /* pc_relative */
611 0, /* bitpos */
612 complain_overflow_dont, /* complain_on_overflow */
613 ppc64_elf_unhandled_reloc, /* special_function */
614 "R_PPC64_PLT16_HA", /* name */
615 false, /* partial_inplace */
616 0, /* src_mask */
617 0xffff, /* dst_mask */
618 false), /* pcrel_offset */
619
620 /* 16-bit section relative relocation. */
621 HOWTO (R_PPC64_SECTOFF, /* type */
622 0, /* rightshift */
623 1, /* size (0 = byte, 1 = short, 2 = long) */
624 16, /* bitsize */
625 false, /* pc_relative */
626 0, /* bitpos */
627 complain_overflow_bitfield, /* complain_on_overflow */
628 ppc64_elf_sectoff_reloc, /* special_function */
629 "R_PPC64_SECTOFF", /* name */
630 false, /* partial_inplace */
631 0, /* src_mask */
632 0xffff, /* dst_mask */
633 false), /* pcrel_offset */
634
635 /* Like R_PPC64_SECTOFF, but no overflow warning. */
636 HOWTO (R_PPC64_SECTOFF_LO, /* type */
637 0, /* rightshift */
638 1, /* size (0 = byte, 1 = short, 2 = long) */
639 16, /* bitsize */
640 false, /* pc_relative */
641 0, /* bitpos */
642 complain_overflow_dont, /* complain_on_overflow */
643 ppc64_elf_sectoff_reloc, /* special_function */
644 "R_PPC64_SECTOFF_LO", /* name */
645 false, /* partial_inplace */
646 0, /* src_mask */
647 0xffff, /* dst_mask */
648 false), /* pcrel_offset */
649
650 /* 16-bit upper half section relative relocation. */
651 HOWTO (R_PPC64_SECTOFF_HI, /* type */
652 16, /* rightshift */
653 1, /* size (0 = byte, 1 = short, 2 = long) */
654 16, /* bitsize */
655 false, /* pc_relative */
656 0, /* bitpos */
657 complain_overflow_dont, /* complain_on_overflow */
658 ppc64_elf_sectoff_reloc, /* special_function */
659 "R_PPC64_SECTOFF_HI", /* name */
660 false, /* partial_inplace */
661 0, /* src_mask */
662 0xffff, /* dst_mask */
663 false), /* pcrel_offset */
664
665 /* 16-bit upper half adjusted section relative relocation. */
666 HOWTO (R_PPC64_SECTOFF_HA, /* type */
667 16, /* rightshift */
668 1, /* size (0 = byte, 1 = short, 2 = long) */
669 16, /* bitsize */
670 false, /* pc_relative */
671 0, /* bitpos */
672 complain_overflow_dont, /* complain_on_overflow */
673 ppc64_elf_sectoff_ha_reloc, /* special_function */
674 "R_PPC64_SECTOFF_HA", /* name */
675 false, /* partial_inplace */
676 0, /* src_mask */
677 0xffff, /* dst_mask */
678 false), /* pcrel_offset */
679
680 /* Like R_PPC64_REL24 without touching the two least significant
681 bits. Should have been named R_PPC64_REL30! */
682 HOWTO (R_PPC64_ADDR30, /* type */
683 2, /* rightshift */
684 2, /* size (0 = byte, 1 = short, 2 = long) */
685 30, /* bitsize */
686 true, /* pc_relative */
687 0, /* bitpos */
688 complain_overflow_dont, /* complain_on_overflow */
689 bfd_elf_generic_reloc, /* special_function */
690 "R_PPC64_ADDR30", /* name */
691 false, /* partial_inplace */
692 0, /* src_mask */
693 0xfffffffc, /* dst_mask */
694 true), /* pcrel_offset */
695
696 /* Relocs in the 64-bit PowerPC ELF ABI, not in the 32-bit ABI. */
697
698 /* A standard 64-bit relocation. */
699 HOWTO (R_PPC64_ADDR64, /* type */
700 0, /* rightshift */
701 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
702 64, /* bitsize */
703 false, /* pc_relative */
704 0, /* bitpos */
705 complain_overflow_dont, /* complain_on_overflow */
706 bfd_elf_generic_reloc, /* special_function */
707 "R_PPC64_ADDR64", /* name */
708 false, /* partial_inplace */
709 0, /* src_mask */
710 0xffffffffffffffff, /* dst_mask */
711 false), /* pcrel_offset */
712
713 /* The bits 32-47 of an address. */
714 HOWTO (R_PPC64_ADDR16_HIGHER, /* type */
715 32, /* rightshift */
716 1, /* size (0 = byte, 1 = short, 2 = long) */
717 16, /* bitsize */
718 false, /* pc_relative */
719 0, /* bitpos */
720 complain_overflow_dont, /* complain_on_overflow */
721 bfd_elf_generic_reloc, /* special_function */
722 "R_PPC64_ADDR16_HIGHER", /* name */
723 false, /* partial_inplace */
724 0, /* src_mask */
725 0xffff, /* dst_mask */
726 false), /* pcrel_offset */
727
728 /* The bits 32-47 of an address, plus 1 if the contents of the low
729 16 bits, treated as a signed number, is negative. */
730 HOWTO (R_PPC64_ADDR16_HIGHERA, /* type */
731 32, /* rightshift */
732 1, /* size (0 = byte, 1 = short, 2 = long) */
733 16, /* bitsize */
734 false, /* pc_relative */
735 0, /* bitpos */
736 complain_overflow_dont, /* complain_on_overflow */
737 ppc64_elf_ha_reloc, /* special_function */
738 "R_PPC64_ADDR16_HIGHERA", /* name */
739 false, /* partial_inplace */
740 0, /* src_mask */
741 0xffff, /* dst_mask */
742 false), /* pcrel_offset */
743
744 /* The bits 48-63 of an address. */
745 HOWTO (R_PPC64_ADDR16_HIGHEST,/* type */
746 48, /* rightshift */
747 1, /* size (0 = byte, 1 = short, 2 = long) */
748 16, /* bitsize */
749 false, /* pc_relative */
750 0, /* bitpos */
751 complain_overflow_dont, /* complain_on_overflow */
752 bfd_elf_generic_reloc, /* special_function */
753 "R_PPC64_ADDR16_HIGHEST", /* name */
754 false, /* partial_inplace */
755 0, /* src_mask */
756 0xffff, /* dst_mask */
757 false), /* pcrel_offset */
758
759 /* The bits 48-63 of an address, plus 1 if the contents of the low
760 16 bits, treated as a signed number, is negative. */
761 HOWTO (R_PPC64_ADDR16_HIGHESTA,/* type */
762 48, /* rightshift */
763 1, /* size (0 = byte, 1 = short, 2 = long) */
764 16, /* bitsize */
765 false, /* pc_relative */
766 0, /* bitpos */
767 complain_overflow_dont, /* complain_on_overflow */
768 ppc64_elf_ha_reloc, /* special_function */
769 "R_PPC64_ADDR16_HIGHESTA", /* name */
770 false, /* partial_inplace */
771 0, /* src_mask */
772 0xffff, /* dst_mask */
773 false), /* pcrel_offset */
774
775 /* Like ADDR64, but may be unaligned. */
776 HOWTO (R_PPC64_UADDR64, /* type */
777 0, /* rightshift */
778 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
779 64, /* bitsize */
780 false, /* pc_relative */
781 0, /* bitpos */
782 complain_overflow_dont, /* complain_on_overflow */
783 bfd_elf_generic_reloc, /* special_function */
784 "R_PPC64_UADDR64", /* name */
785 false, /* partial_inplace */
786 0, /* src_mask */
787 0xffffffffffffffff, /* dst_mask */
788 false), /* pcrel_offset */
789
790 /* 64-bit relative relocation. */
791 HOWTO (R_PPC64_REL64, /* type */
792 0, /* rightshift */
793 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
794 64, /* bitsize */
795 true, /* pc_relative */
796 0, /* bitpos */
797 complain_overflow_dont, /* complain_on_overflow */
798 bfd_elf_generic_reloc, /* special_function */
799 "R_PPC64_REL64", /* name */
800 false, /* partial_inplace */
801 0, /* src_mask */
802 0xffffffffffffffff, /* dst_mask */
803 true), /* pcrel_offset */
804
805 /* 64-bit relocation to the symbol's procedure linkage table. */
806 HOWTO (R_PPC64_PLT64, /* type */
807 0, /* rightshift */
808 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
809 64, /* bitsize */
810 false, /* pc_relative */
811 0, /* bitpos */
812 complain_overflow_dont, /* complain_on_overflow */
813 ppc64_elf_unhandled_reloc, /* special_function */
814 "R_PPC64_PLT64", /* name */
815 false, /* partial_inplace */
816 0, /* src_mask */
817 0, /* dst_mask */
818 false), /* pcrel_offset */
819
820 /* 64-bit PC relative relocation to the symbol's procedure linkage
821 table. */
822 /* FIXME: R_PPC64_PLTREL64 not supported. */
823 HOWTO (R_PPC64_PLTREL64, /* type */
824 0, /* rightshift */
825 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
826 64, /* bitsize */
827 true, /* pc_relative */
828 0, /* bitpos */
829 complain_overflow_dont, /* complain_on_overflow */
830 ppc64_elf_unhandled_reloc, /* special_function */
831 "R_PPC64_PLTREL64", /* name */
832 false, /* partial_inplace */
833 0, /* src_mask */
834 0, /* dst_mask */
835 true), /* pcrel_offset */
836
837 /* 16 bit TOC-relative relocation. */
838
839 /* R_PPC64_TOC16 47 half16* S + A - .TOC. */
840 HOWTO (R_PPC64_TOC16, /* type */
841 0, /* rightshift */
842 1, /* size (0 = byte, 1 = short, 2 = long) */
843 16, /* bitsize */
844 false, /* pc_relative */
845 0, /* bitpos */
846 complain_overflow_signed, /* complain_on_overflow */
847 ppc64_elf_toc_reloc, /* special_function */
848 "R_PPC64_TOC16", /* name */
849 false, /* partial_inplace */
850 0, /* src_mask */
851 0xffff, /* dst_mask */
852 false), /* pcrel_offset */
853
854 /* 16 bit TOC-relative relocation without overflow. */
855
856 /* R_PPC64_TOC16_LO 48 half16 #lo (S + A - .TOC.) */
857 HOWTO (R_PPC64_TOC16_LO, /* type */
858 0, /* rightshift */
859 1, /* size (0 = byte, 1 = short, 2 = long) */
860 16, /* bitsize */
861 false, /* pc_relative */
862 0, /* bitpos */
863 complain_overflow_dont, /* complain_on_overflow */
864 ppc64_elf_toc_reloc, /* special_function */
865 "R_PPC64_TOC16_LO", /* name */
866 false, /* partial_inplace */
867 0, /* src_mask */
868 0xffff, /* dst_mask */
869 false), /* pcrel_offset */
870
871 /* 16 bit TOC-relative relocation, high 16 bits. */
872
873 /* R_PPC64_TOC16_HI 49 half16 #hi (S + A - .TOC.) */
874 HOWTO (R_PPC64_TOC16_HI, /* type */
875 16, /* rightshift */
876 1, /* size (0 = byte, 1 = short, 2 = long) */
877 16, /* bitsize */
878 false, /* pc_relative */
879 0, /* bitpos */
880 complain_overflow_dont, /* complain_on_overflow */
881 ppc64_elf_toc_reloc, /* special_function */
882 "R_PPC64_TOC16_HI", /* name */
883 false, /* partial_inplace */
884 0, /* src_mask */
885 0xffff, /* dst_mask */
886 false), /* pcrel_offset */
887
888 /* 16 bit TOC-relative relocation, high 16 bits, plus 1 if the
889 contents of the low 16 bits, treated as a signed number, is
890 negative. */
891
892 /* R_PPC64_TOC16_HA 50 half16 #ha (S + A - .TOC.) */
893 HOWTO (R_PPC64_TOC16_HA, /* type */
894 16, /* rightshift */
895 1, /* size (0 = byte, 1 = short, 2 = long) */
896 16, /* bitsize */
897 false, /* pc_relative */
898 0, /* bitpos */
899 complain_overflow_dont, /* complain_on_overflow */
900 ppc64_elf_toc_ha_reloc, /* special_function */
901 "R_PPC64_TOC16_HA", /* name */
902 false, /* partial_inplace */
903 0, /* src_mask */
904 0xffff, /* dst_mask */
905 false), /* pcrel_offset */
906
907 /* 64-bit relocation; insert value of TOC base (.TOC.). */
908
909 /* R_PPC64_TOC 51 doubleword64 .TOC. */
910 HOWTO (R_PPC64_TOC, /* type */
911 0, /* rightshift */
912 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
913 64, /* bitsize */
914 false, /* pc_relative */
915 0, /* bitpos */
916 complain_overflow_bitfield, /* complain_on_overflow */
917 ppc64_elf_toc64_reloc, /* special_function */
918 "R_PPC64_TOC", /* name */
919 false, /* partial_inplace */
920 0, /* src_mask */
921 0xffffffffffffffff, /* dst_mask */
922 false), /* pcrel_offset */
923
924 /* Like R_PPC64_GOT16, but also informs the link editor that the
925 value to relocate may (!) refer to a PLT entry which the link
926 editor (a) may replace with the symbol value. If the link editor
927 is unable to fully resolve the symbol, it may (b) create a PLT
928 entry and store the address to the new PLT entry in the GOT.
929 This permits lazy resolution of function symbols at run time.
930 The link editor may also skip all of this and just (c) emit a
931 R_PPC64_GLOB_DAT to tie the symbol to the GOT entry. */
932 /* FIXME: R_PPC64_PLTGOT16 not implemented. */
933 HOWTO (R_PPC64_PLTGOT16, /* type */
934 0, /* rightshift */
935 1, /* size (0 = byte, 1 = short, 2 = long) */
936 16, /* bitsize */
937 false, /* pc_relative */
938 0, /* bitpos */
939 complain_overflow_signed, /* complain_on_overflow */
940 ppc64_elf_unhandled_reloc, /* special_function */
941 "R_PPC64_PLTGOT16", /* name */
942 false, /* partial_inplace */
943 0, /* src_mask */
944 0xffff, /* dst_mask */
945 false), /* pcrel_offset */
946
947 /* Like R_PPC64_PLTGOT16, but without overflow. */
948 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */
949 HOWTO (R_PPC64_PLTGOT16_LO, /* type */
950 0, /* rightshift */
951 1, /* size (0 = byte, 1 = short, 2 = long) */
952 16, /* bitsize */
953 false, /* pc_relative */
954 0, /* bitpos */
955 complain_overflow_dont, /* complain_on_overflow */
956 ppc64_elf_unhandled_reloc, /* special_function */
957 "R_PPC64_PLTGOT16_LO", /* name */
958 false, /* partial_inplace */
959 0, /* src_mask */
960 0xffff, /* dst_mask */
961 false), /* pcrel_offset */
962
963 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address. */
964 /* FIXME: R_PPC64_PLTGOT16_HI not implemented. */
965 HOWTO (R_PPC64_PLTGOT16_HI, /* type */
966 16, /* rightshift */
967 1, /* size (0 = byte, 1 = short, 2 = long) */
968 16, /* bitsize */
969 false, /* pc_relative */
970 0, /* bitpos */
971 complain_overflow_dont, /* complain_on_overflow */
972 ppc64_elf_unhandled_reloc, /* special_function */
973 "R_PPC64_PLTGOT16_HI", /* name */
974 false, /* partial_inplace */
975 0, /* src_mask */
976 0xffff, /* dst_mask */
977 false), /* pcrel_offset */
978
979 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address, plus
980 1 if the contents of the low 16 bits, treated as a signed number,
981 is negative. */
982 /* FIXME: R_PPC64_PLTGOT16_HA not implemented. */
983 HOWTO (R_PPC64_PLTGOT16_HA, /* type */
984 16, /* rightshift */
985 1, /* size (0 = byte, 1 = short, 2 = long) */
986 16, /* bitsize */
987 false, /* pc_relative */
988 0, /* bitpos */
989 complain_overflow_dont,/* complain_on_overflow */
990 ppc64_elf_unhandled_reloc, /* special_function */
991 "R_PPC64_PLTGOT16_HA", /* name */
992 false, /* partial_inplace */
993 0, /* src_mask */
994 0xffff, /* dst_mask */
995 false), /* pcrel_offset */
996
997 /* Like R_PPC64_ADDR16, but for instructions with a DS field. */
998 HOWTO (R_PPC64_ADDR16_DS, /* type */
999 0, /* rightshift */
1000 1, /* size (0 = byte, 1 = short, 2 = long) */
1001 16, /* bitsize */
1002 false, /* pc_relative */
1003 0, /* bitpos */
1004 complain_overflow_bitfield, /* complain_on_overflow */
1005 bfd_elf_generic_reloc, /* special_function */
1006 "R_PPC64_ADDR16_DS", /* name */
1007 false, /* partial_inplace */
1008 0, /* src_mask */
1009 0xfffc, /* dst_mask */
1010 false), /* pcrel_offset */
1011
1012 /* Like R_PPC64_ADDR16_LO, but for instructions with a DS field. */
1013 HOWTO (R_PPC64_ADDR16_LO_DS, /* type */
1014 0, /* rightshift */
1015 1, /* size (0 = byte, 1 = short, 2 = long) */
1016 16, /* bitsize */
1017 false, /* pc_relative */
1018 0, /* bitpos */
1019 complain_overflow_dont,/* complain_on_overflow */
1020 bfd_elf_generic_reloc, /* special_function */
1021 "R_PPC64_ADDR16_LO_DS",/* name */
1022 false, /* partial_inplace */
1023 0, /* src_mask */
1024 0xfffc, /* dst_mask */
1025 false), /* pcrel_offset */
1026
1027 /* Like R_PPC64_GOT16, but for instructions with a DS field. */
1028 HOWTO (R_PPC64_GOT16_DS, /* type */
1029 0, /* rightshift */
1030 1, /* size (0 = byte, 1 = short, 2 = long) */
1031 16, /* bitsize */
1032 false, /* pc_relative */
1033 0, /* bitpos */
1034 complain_overflow_signed, /* complain_on_overflow */
1035 ppc64_elf_unhandled_reloc, /* special_function */
1036 "R_PPC64_GOT16_DS", /* name */
1037 false, /* partial_inplace */
1038 0, /* src_mask */
1039 0xfffc, /* dst_mask */
1040 false), /* pcrel_offset */
1041
1042 /* Like R_PPC64_GOT16_LO, but for instructions with a DS field. */
1043 HOWTO (R_PPC64_GOT16_LO_DS, /* type */
1044 0, /* rightshift */
1045 1, /* size (0 = byte, 1 = short, 2 = long) */
1046 16, /* bitsize */
1047 false, /* pc_relative */
1048 0, /* bitpos */
1049 complain_overflow_dont, /* complain_on_overflow */
1050 ppc64_elf_unhandled_reloc, /* special_function */
1051 "R_PPC64_GOT16_LO_DS", /* name */
1052 false, /* partial_inplace */
1053 0, /* src_mask */
1054 0xfffc, /* dst_mask */
1055 false), /* pcrel_offset */
1056
1057 /* Like R_PPC64_PLT16_LO, but for instructions with a DS field. */
1058 HOWTO (R_PPC64_PLT16_LO_DS, /* type */
1059 0, /* rightshift */
1060 1, /* size (0 = byte, 1 = short, 2 = long) */
1061 16, /* bitsize */
1062 false, /* pc_relative */
1063 0, /* bitpos */
1064 complain_overflow_dont, /* complain_on_overflow */
1065 ppc64_elf_unhandled_reloc, /* special_function */
1066 "R_PPC64_PLT16_LO_DS", /* name */
1067 false, /* partial_inplace */
1068 0, /* src_mask */
1069 0xfffc, /* dst_mask */
1070 false), /* pcrel_offset */
1071
1072 /* Like R_PPC64_SECTOFF, but for instructions with a DS field. */
1073 HOWTO (R_PPC64_SECTOFF_DS, /* type */
1074 0, /* rightshift */
1075 1, /* size (0 = byte, 1 = short, 2 = long) */
1076 16, /* bitsize */
1077 false, /* pc_relative */
1078 0, /* bitpos */
1079 complain_overflow_bitfield, /* complain_on_overflow */
1080 ppc64_elf_sectoff_reloc, /* special_function */
1081 "R_PPC64_SECTOFF_DS", /* name */
1082 false, /* partial_inplace */
1083 0, /* src_mask */
1084 0xfffc, /* dst_mask */
1085 false), /* pcrel_offset */
1086
1087 /* Like R_PPC64_SECTOFF_LO, but for instructions with a DS field. */
1088 HOWTO (R_PPC64_SECTOFF_LO_DS, /* type */
1089 0, /* rightshift */
1090 1, /* size (0 = byte, 1 = short, 2 = long) */
1091 16, /* bitsize */
1092 false, /* pc_relative */
1093 0, /* bitpos */
1094 complain_overflow_dont, /* complain_on_overflow */
1095 ppc64_elf_sectoff_reloc, /* special_function */
1096 "R_PPC64_SECTOFF_LO_DS",/* name */
1097 false, /* partial_inplace */
1098 0, /* src_mask */
1099 0xfffc, /* dst_mask */
1100 false), /* pcrel_offset */
1101
1102 /* Like R_PPC64_TOC16, but for instructions with a DS field. */
1103 HOWTO (R_PPC64_TOC16_DS, /* type */
1104 0, /* rightshift */
1105 1, /* size (0 = byte, 1 = short, 2 = long) */
1106 16, /* bitsize */
1107 false, /* pc_relative */
1108 0, /* bitpos */
1109 complain_overflow_signed, /* complain_on_overflow */
1110 ppc64_elf_toc_reloc, /* special_function */
1111 "R_PPC64_TOC16_DS", /* name */
1112 false, /* partial_inplace */
1113 0, /* src_mask */
1114 0xfffc, /* dst_mask */
1115 false), /* pcrel_offset */
1116
1117 /* Like R_PPC64_TOC16_LO, but for instructions with a DS field. */
1118 HOWTO (R_PPC64_TOC16_LO_DS, /* type */
1119 0, /* rightshift */
1120 1, /* size (0 = byte, 1 = short, 2 = long) */
1121 16, /* bitsize */
1122 false, /* pc_relative */
1123 0, /* bitpos */
1124 complain_overflow_dont, /* complain_on_overflow */
1125 ppc64_elf_toc_reloc, /* special_function */
1126 "R_PPC64_TOC16_LO_DS", /* name */
1127 false, /* partial_inplace */
1128 0, /* src_mask */
1129 0xfffc, /* dst_mask */
1130 false), /* pcrel_offset */
1131
1132 /* Like R_PPC64_PLTGOT16, but for instructions with a DS field. */
1133 /* FIXME: R_PPC64_PLTGOT16_DS not implemented. */
1134 HOWTO (R_PPC64_PLTGOT16_DS, /* type */
1135 0, /* rightshift */
1136 1, /* size (0 = byte, 1 = short, 2 = long) */
1137 16, /* bitsize */
1138 false, /* pc_relative */
1139 0, /* bitpos */
1140 complain_overflow_signed, /* complain_on_overflow */
1141 ppc64_elf_unhandled_reloc, /* special_function */
1142 "R_PPC64_PLTGOT16_DS", /* name */
1143 false, /* partial_inplace */
1144 0, /* src_mask */
1145 0xfffc, /* dst_mask */
1146 false), /* pcrel_offset */
1147
1148 /* Like R_PPC64_PLTGOT16_LO, but for instructions with a DS field. */
1149 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */
1150 HOWTO (R_PPC64_PLTGOT16_LO_DS,/* type */
1151 0, /* rightshift */
1152 1, /* size (0 = byte, 1 = short, 2 = long) */
1153 16, /* bitsize */
1154 false, /* pc_relative */
1155 0, /* bitpos */
1156 complain_overflow_dont, /* complain_on_overflow */
1157 ppc64_elf_unhandled_reloc, /* special_function */
1158 "R_PPC64_PLTGOT16_LO_DS",/* name */
1159 false, /* partial_inplace */
1160 0, /* src_mask */
1161 0xfffc, /* dst_mask */
1162 false), /* pcrel_offset */
1163
1164 /* GNU extension to record C++ vtable hierarchy. */
1165 HOWTO (R_PPC64_GNU_VTINHERIT, /* type */
1166 0, /* rightshift */
1167 0, /* size (0 = byte, 1 = short, 2 = long) */
1168 0, /* bitsize */
1169 false, /* pc_relative */
1170 0, /* bitpos */
1171 complain_overflow_dont, /* complain_on_overflow */
1172 NULL, /* special_function */
1173 "R_PPC64_GNU_VTINHERIT", /* name */
1174 false, /* partial_inplace */
1175 0, /* src_mask */
1176 0, /* dst_mask */
1177 false), /* pcrel_offset */
1178
1179 /* GNU extension to record C++ vtable member usage. */
1180 HOWTO (R_PPC64_GNU_VTENTRY, /* type */
1181 0, /* rightshift */
1182 0, /* size (0 = byte, 1 = short, 2 = long) */
1183 0, /* bitsize */
1184 false, /* pc_relative */
1185 0, /* bitpos */
1186 complain_overflow_dont, /* complain_on_overflow */
1187 NULL, /* special_function */
1188 "R_PPC64_GNU_VTENTRY", /* name */
1189 false, /* partial_inplace */
1190 0, /* src_mask */
1191 0, /* dst_mask */
1192 false), /* pcrel_offset */
1193 };
1194
1195 \f
1196 /* Initialize the ppc64_elf_howto_table, so that linear accesses can
1197 be done. */
1198
1199 static void
1200 ppc_howto_init ()
1201 {
1202 unsigned int i, type;
1203
1204 for (i = 0;
1205 i < sizeof (ppc64_elf_howto_raw) / sizeof (ppc64_elf_howto_raw[0]);
1206 i++)
1207 {
1208 type = ppc64_elf_howto_raw[i].type;
1209 BFD_ASSERT (type < (sizeof (ppc64_elf_howto_table)
1210 / sizeof (ppc64_elf_howto_table[0])));
1211 ppc64_elf_howto_table[type] = &ppc64_elf_howto_raw[i];
1212 }
1213 }
1214
1215 static reloc_howto_type *
1216 ppc64_elf_reloc_type_lookup (abfd, code)
1217 bfd *abfd ATTRIBUTE_UNUSED;
1218 bfd_reloc_code_real_type code;
1219 {
1220 enum elf_ppc_reloc_type ppc_reloc = R_PPC_NONE;
1221
1222 if (!ppc64_elf_howto_table[R_PPC64_ADDR32])
1223 /* Initialize howto table if needed. */
1224 ppc_howto_init ();
1225
1226 switch ((int) code)
1227 {
1228 default:
1229 return (reloc_howto_type *) NULL;
1230
1231 case BFD_RELOC_NONE: ppc_reloc = R_PPC64_NONE;
1232 break;
1233 case BFD_RELOC_32: ppc_reloc = R_PPC64_ADDR32;
1234 break;
1235 case BFD_RELOC_PPC_BA26: ppc_reloc = R_PPC64_ADDR24;
1236 break;
1237 case BFD_RELOC_16: ppc_reloc = R_PPC64_ADDR16;
1238 break;
1239 case BFD_RELOC_LO16: ppc_reloc = R_PPC64_ADDR16_LO;
1240 break;
1241 case BFD_RELOC_HI16: ppc_reloc = R_PPC64_ADDR16_HI;
1242 break;
1243 case BFD_RELOC_HI16_S: ppc_reloc = R_PPC64_ADDR16_HA;
1244 break;
1245 case BFD_RELOC_PPC_BA16: ppc_reloc = R_PPC64_ADDR14;
1246 break;
1247 case BFD_RELOC_PPC_BA16_BRTAKEN: ppc_reloc = R_PPC64_ADDR14_BRTAKEN;
1248 break;
1249 case BFD_RELOC_PPC_BA16_BRNTAKEN: ppc_reloc = R_PPC64_ADDR14_BRNTAKEN;
1250 break;
1251 case BFD_RELOC_PPC_B26: ppc_reloc = R_PPC64_REL24;
1252 break;
1253 case BFD_RELOC_PPC_B16: ppc_reloc = R_PPC64_REL14;
1254 break;
1255 case BFD_RELOC_PPC_B16_BRTAKEN: ppc_reloc = R_PPC64_REL14_BRTAKEN;
1256 break;
1257 case BFD_RELOC_PPC_B16_BRNTAKEN: ppc_reloc = R_PPC64_REL14_BRNTAKEN;
1258 break;
1259 case BFD_RELOC_16_GOTOFF: ppc_reloc = R_PPC64_GOT16;
1260 break;
1261 case BFD_RELOC_LO16_GOTOFF: ppc_reloc = R_PPC64_GOT16_LO;
1262 break;
1263 case BFD_RELOC_HI16_GOTOFF: ppc_reloc = R_PPC64_GOT16_HI;
1264 break;
1265 case BFD_RELOC_HI16_S_GOTOFF: ppc_reloc = R_PPC64_GOT16_HA;
1266 break;
1267 case BFD_RELOC_PPC_COPY: ppc_reloc = R_PPC64_COPY;
1268 break;
1269 case BFD_RELOC_PPC_GLOB_DAT: ppc_reloc = R_PPC64_GLOB_DAT;
1270 break;
1271 case BFD_RELOC_32_PCREL: ppc_reloc = R_PPC64_REL32;
1272 break;
1273 case BFD_RELOC_32_PLTOFF: ppc_reloc = R_PPC64_PLT32;
1274 break;
1275 case BFD_RELOC_32_PLT_PCREL: ppc_reloc = R_PPC64_PLTREL32;
1276 break;
1277 case BFD_RELOC_LO16_PLTOFF: ppc_reloc = R_PPC64_PLT16_LO;
1278 break;
1279 case BFD_RELOC_HI16_PLTOFF: ppc_reloc = R_PPC64_PLT16_HI;
1280 break;
1281 case BFD_RELOC_HI16_S_PLTOFF: ppc_reloc = R_PPC64_PLT16_HA;
1282 break;
1283 case BFD_RELOC_16_BASEREL: ppc_reloc = R_PPC64_SECTOFF;
1284 break;
1285 case BFD_RELOC_LO16_BASEREL: ppc_reloc = R_PPC64_SECTOFF_LO;
1286 break;
1287 case BFD_RELOC_HI16_BASEREL: ppc_reloc = R_PPC64_SECTOFF_HI;
1288 break;
1289 case BFD_RELOC_HI16_S_BASEREL: ppc_reloc = R_PPC64_SECTOFF_HA;
1290 break;
1291 case BFD_RELOC_CTOR: ppc_reloc = R_PPC64_ADDR64;
1292 break;
1293 case BFD_RELOC_64: ppc_reloc = R_PPC64_ADDR64;
1294 break;
1295 case BFD_RELOC_PPC64_HIGHER: ppc_reloc = R_PPC64_ADDR16_HIGHER;
1296 break;
1297 case BFD_RELOC_PPC64_HIGHER_S: ppc_reloc = R_PPC64_ADDR16_HIGHERA;
1298 break;
1299 case BFD_RELOC_PPC64_HIGHEST: ppc_reloc = R_PPC64_ADDR16_HIGHEST;
1300 break;
1301 case BFD_RELOC_PPC64_HIGHEST_S: ppc_reloc = R_PPC64_ADDR16_HIGHESTA;
1302 break;
1303 case BFD_RELOC_64_PCREL: ppc_reloc = R_PPC64_REL64;
1304 break;
1305 case BFD_RELOC_64_PLTOFF: ppc_reloc = R_PPC64_PLT64;
1306 break;
1307 case BFD_RELOC_64_PLT_PCREL: ppc_reloc = R_PPC64_PLTREL64;
1308 break;
1309 case BFD_RELOC_PPC_TOC16: ppc_reloc = R_PPC64_TOC16;
1310 break;
1311 case BFD_RELOC_PPC64_TOC16_LO: ppc_reloc = R_PPC64_TOC16_LO;
1312 break;
1313 case BFD_RELOC_PPC64_TOC16_HI: ppc_reloc = R_PPC64_TOC16_HI;
1314 break;
1315 case BFD_RELOC_PPC64_TOC16_HA: ppc_reloc = R_PPC64_TOC16_HA;
1316 break;
1317 case BFD_RELOC_PPC64_TOC: ppc_reloc = R_PPC64_TOC;
1318 break;
1319 case BFD_RELOC_PPC64_PLTGOT16: ppc_reloc = R_PPC64_PLTGOT16;
1320 break;
1321 case BFD_RELOC_PPC64_PLTGOT16_LO: ppc_reloc = R_PPC64_PLTGOT16_LO;
1322 break;
1323 case BFD_RELOC_PPC64_PLTGOT16_HI: ppc_reloc = R_PPC64_PLTGOT16_HI;
1324 break;
1325 case BFD_RELOC_PPC64_PLTGOT16_HA: ppc_reloc = R_PPC64_PLTGOT16_HA;
1326 break;
1327 case BFD_RELOC_PPC64_ADDR16_DS: ppc_reloc = R_PPC64_ADDR16_DS;
1328 break;
1329 case BFD_RELOC_PPC64_ADDR16_LO_DS: ppc_reloc = R_PPC64_ADDR16_LO_DS;
1330 break;
1331 case BFD_RELOC_PPC64_GOT16_DS: ppc_reloc = R_PPC64_GOT16_DS;
1332 break;
1333 case BFD_RELOC_PPC64_GOT16_LO_DS: ppc_reloc = R_PPC64_GOT16_LO_DS;
1334 break;
1335 case BFD_RELOC_PPC64_PLT16_LO_DS: ppc_reloc = R_PPC64_PLT16_LO_DS;
1336 break;
1337 case BFD_RELOC_PPC64_SECTOFF_DS: ppc_reloc = R_PPC64_SECTOFF_DS;
1338 break;
1339 case BFD_RELOC_PPC64_SECTOFF_LO_DS: ppc_reloc = R_PPC64_SECTOFF_LO_DS;
1340 break;
1341 case BFD_RELOC_PPC64_TOC16_DS: ppc_reloc = R_PPC64_TOC16_DS;
1342 break;
1343 case BFD_RELOC_PPC64_TOC16_LO_DS: ppc_reloc = R_PPC64_TOC16_LO_DS;
1344 break;
1345 case BFD_RELOC_PPC64_PLTGOT16_DS: ppc_reloc = R_PPC64_PLTGOT16_DS;
1346 break;
1347 case BFD_RELOC_PPC64_PLTGOT16_LO_DS: ppc_reloc = R_PPC64_PLTGOT16_LO_DS;
1348 break;
1349 case BFD_RELOC_VTABLE_INHERIT: ppc_reloc = R_PPC64_GNU_VTINHERIT;
1350 break;
1351 case BFD_RELOC_VTABLE_ENTRY: ppc_reloc = R_PPC64_GNU_VTENTRY;
1352 break;
1353 }
1354
1355 return ppc64_elf_howto_table[(int) ppc_reloc];
1356 };
1357
1358 /* Set the howto pointer for a PowerPC ELF reloc. */
1359
1360 static void
1361 ppc64_elf_info_to_howto (abfd, cache_ptr, dst)
1362 bfd *abfd ATTRIBUTE_UNUSED;
1363 arelent *cache_ptr;
1364 Elf64_Internal_Rela *dst;
1365 {
1366 unsigned int type;
1367
1368 if (!ppc64_elf_howto_table[R_PPC64_ADDR32])
1369 /* Initialize howto table if needed. */
1370 ppc_howto_init ();
1371
1372 type = ELF64_R_TYPE (dst->r_info);
1373 BFD_ASSERT (type < (sizeof (ppc64_elf_howto_table)
1374 / sizeof (ppc64_elf_howto_table[0])));
1375 cache_ptr->howto = ppc64_elf_howto_table[type];
1376 }
1377
1378 /* Handle the R_PPC_ADDR16_HA and similar relocs. */
1379
1380 static bfd_reloc_status_type
1381 ppc64_elf_ha_reloc (abfd, reloc_entry, symbol, data,
1382 input_section, output_bfd, error_message)
1383 bfd *abfd;
1384 arelent *reloc_entry;
1385 asymbol *symbol;
1386 PTR data;
1387 asection *input_section;
1388 bfd *output_bfd;
1389 char **error_message;
1390 {
1391 /* If this is a relocatable link (output_bfd test tells us), just
1392 call the generic function. Any adjustment will be done at final
1393 link time. */
1394 if (output_bfd != NULL)
1395 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1396 input_section, output_bfd, error_message);
1397
1398 /* Adjust the addend for sign extension of the low 16 bits.
1399 We won't actually be using the low 16 bits, so trashing them
1400 doesn't matter. */
1401 reloc_entry->addend += 0x8000;
1402 return bfd_reloc_continue;
1403 }
1404
1405 static bfd_reloc_status_type
1406 ppc64_elf_brtaken_reloc (abfd, reloc_entry, symbol, data,
1407 input_section, output_bfd, error_message)
1408 bfd *abfd;
1409 arelent *reloc_entry;
1410 asymbol *symbol;
1411 PTR data;
1412 asection *input_section;
1413 bfd *output_bfd;
1414 char **error_message;
1415 {
1416 long insn;
1417 enum elf_ppc_reloc_type r_type;
1418 bfd_size_type octets;
1419 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */
1420 boolean is_power4 = false;
1421
1422 /* If this is a relocatable link (output_bfd test tells us), just
1423 call the generic function. Any adjustment will be done at final
1424 link time. */
1425 if (output_bfd != NULL)
1426 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1427 input_section, output_bfd, error_message);
1428
1429 octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1430 insn = bfd_get_32 (abfd, (bfd_byte *) data + octets);
1431 insn &= ~(0x01 << 21);
1432 r_type = (enum elf_ppc_reloc_type) reloc_entry->howto->type;
1433 if (r_type == R_PPC64_ADDR14_BRTAKEN
1434 || r_type == R_PPC64_REL14_BRTAKEN)
1435 insn |= 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */
1436
1437 if (is_power4)
1438 {
1439 /* Set 'a' bit. This is 0b00010 in BO field for branch
1440 on CR(BI) insns (BO == 001at or 011at), and 0b01000
1441 for branch on CTR insns (BO == 1a00t or 1a01t). */
1442 if ((insn & (0x14 << 21)) == (0x04 << 21))
1443 insn |= 0x02 << 21;
1444 else if ((insn & (0x14 << 21)) == (0x10 << 21))
1445 insn |= 0x08 << 21;
1446 else
1447 return bfd_reloc_continue;
1448 }
1449 else
1450 {
1451 bfd_vma target = 0;
1452 bfd_vma from;
1453
1454 if (!bfd_is_com_section (symbol->section))
1455 target = symbol->value;
1456 target += symbol->section->output_section->vma;
1457 target += symbol->section->output_offset;
1458 target += reloc_entry->addend;
1459
1460 from = (reloc_entry->address
1461 + input_section->output_offset
1462 + input_section->output_section->vma);
1463
1464 /* Invert 'y' bit if not the default. */
1465 if ((bfd_signed_vma) (target - from) < 0)
1466 insn ^= 0x01 << 21;
1467 }
1468 bfd_put_32 (abfd, (bfd_vma) insn, (bfd_byte *) data + octets);
1469 return bfd_reloc_continue;
1470 }
1471
1472 static bfd_reloc_status_type
1473 ppc64_elf_sectoff_reloc (abfd, reloc_entry, symbol, data,
1474 input_section, output_bfd, error_message)
1475 bfd *abfd;
1476 arelent *reloc_entry;
1477 asymbol *symbol;
1478 PTR data;
1479 asection *input_section;
1480 bfd *output_bfd;
1481 char **error_message;
1482 {
1483 /* If this is a relocatable link (output_bfd test tells us), just
1484 call the generic function. Any adjustment will be done at final
1485 link time. */
1486 if (output_bfd != NULL)
1487 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1488 input_section, output_bfd, error_message);
1489
1490 /* Subtract the symbol section base address. */
1491 reloc_entry->addend -= symbol->section->output_section->vma;
1492 return bfd_reloc_continue;
1493 }
1494
1495 static bfd_reloc_status_type
1496 ppc64_elf_sectoff_ha_reloc (abfd, reloc_entry, symbol, data,
1497 input_section, output_bfd, error_message)
1498 bfd *abfd;
1499 arelent *reloc_entry;
1500 asymbol *symbol;
1501 PTR data;
1502 asection *input_section;
1503 bfd *output_bfd;
1504 char **error_message;
1505 {
1506 /* If this is a relocatable link (output_bfd test tells us), just
1507 call the generic function. Any adjustment will be done at final
1508 link time. */
1509 if (output_bfd != NULL)
1510 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1511 input_section, output_bfd, error_message);
1512
1513 /* Subtract the symbol section base address. */
1514 reloc_entry->addend -= symbol->section->output_section->vma;
1515
1516 /* Adjust the addend for sign extension of the low 16 bits. */
1517 reloc_entry->addend += 0x8000;
1518 return bfd_reloc_continue;
1519 }
1520
1521 static bfd_reloc_status_type
1522 ppc64_elf_toc_reloc (abfd, reloc_entry, symbol, data,
1523 input_section, output_bfd, error_message)
1524 bfd *abfd;
1525 arelent *reloc_entry;
1526 asymbol *symbol;
1527 PTR data;
1528 asection *input_section;
1529 bfd *output_bfd;
1530 char **error_message;
1531 {
1532 bfd_vma TOCstart;
1533
1534 /* If this is a relocatable link (output_bfd test tells us), just
1535 call the generic function. Any adjustment will be done at final
1536 link time. */
1537 if (output_bfd != NULL)
1538 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1539 input_section, output_bfd, error_message);
1540
1541 TOCstart = _bfd_get_gp_value (input_section->output_section->owner);
1542 if (TOCstart == 0)
1543 TOCstart = ppc64_elf_toc (input_section->output_section->owner);
1544
1545 /* Subtract the TOC base address. */
1546 reloc_entry->addend -= TOCstart + TOC_BASE_OFF;
1547 return bfd_reloc_continue;
1548 }
1549
1550 static bfd_reloc_status_type
1551 ppc64_elf_toc_ha_reloc (abfd, reloc_entry, symbol, data,
1552 input_section, output_bfd, error_message)
1553 bfd *abfd;
1554 arelent *reloc_entry;
1555 asymbol *symbol;
1556 PTR data;
1557 asection *input_section;
1558 bfd *output_bfd;
1559 char **error_message;
1560 {
1561 bfd_vma TOCstart;
1562
1563 /* If this is a relocatable link (output_bfd test tells us), just
1564 call the generic function. Any adjustment will be done at final
1565 link time. */
1566 if (output_bfd != NULL)
1567 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1568 input_section, output_bfd, error_message);
1569
1570 TOCstart = _bfd_get_gp_value (input_section->output_section->owner);
1571 if (TOCstart == 0)
1572 TOCstart = ppc64_elf_toc (input_section->output_section->owner);
1573
1574 /* Subtract the TOC base address. */
1575 reloc_entry->addend -= TOCstart + TOC_BASE_OFF;
1576
1577 /* Adjust the addend for sign extension of the low 16 bits. */
1578 reloc_entry->addend += 0x8000;
1579 return bfd_reloc_continue;
1580 }
1581
1582 static bfd_reloc_status_type
1583 ppc64_elf_toc64_reloc (abfd, reloc_entry, symbol, data,
1584 input_section, output_bfd, error_message)
1585 bfd *abfd;
1586 arelent *reloc_entry;
1587 asymbol *symbol;
1588 PTR data;
1589 asection *input_section;
1590 bfd *output_bfd;
1591 char **error_message;
1592 {
1593 bfd_vma TOCstart;
1594 bfd_size_type octets;
1595
1596 /* If this is a relocatable link (output_bfd test tells us), just
1597 call the generic function. Any adjustment will be done at final
1598 link time. */
1599 if (output_bfd != NULL)
1600 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1601 input_section, output_bfd, error_message);
1602
1603 TOCstart = _bfd_get_gp_value (input_section->output_section->owner);
1604 if (TOCstart == 0)
1605 TOCstart = ppc64_elf_toc (input_section->output_section->owner);
1606
1607 octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1608 bfd_put_64 (abfd, TOCstart + TOC_BASE_OFF, (bfd_byte *) data + octets);
1609 return bfd_reloc_ok;
1610 }
1611
1612 static bfd_reloc_status_type
1613 ppc64_elf_unhandled_reloc (abfd, reloc_entry, symbol, data,
1614 input_section, output_bfd, error_message)
1615 bfd *abfd;
1616 arelent *reloc_entry;
1617 asymbol *symbol;
1618 PTR data;
1619 asection *input_section;
1620 bfd *output_bfd;
1621 char **error_message;
1622 {
1623 /* If this is a relocatable link (output_bfd test tells us), just
1624 call the generic function. Any adjustment will be done at final
1625 link time. */
1626 if (output_bfd != NULL)
1627 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1628 input_section, output_bfd, error_message);
1629
1630 if (error_message != NULL)
1631 {
1632 static char buf[60];
1633 sprintf (buf, "generic linker can't handle %s",
1634 reloc_entry->howto->name);
1635 *error_message = buf;
1636 }
1637 return bfd_reloc_dangerous;
1638 }
1639
1640 /* Function to set whether a module needs the -mrelocatable bit set. */
1641
1642 static boolean
1643 ppc64_elf_set_private_flags (abfd, flags)
1644 bfd *abfd;
1645 flagword flags;
1646 {
1647 BFD_ASSERT (!elf_flags_init (abfd)
1648 || elf_elfheader (abfd)->e_flags == flags);
1649
1650 elf_elfheader (abfd)->e_flags = flags;
1651 elf_flags_init (abfd) = true;
1652 return true;
1653 }
1654
1655 /* Merge backend specific data from an object file to the output
1656 object file when linking. */
1657 static boolean
1658 ppc64_elf_merge_private_bfd_data (ibfd, obfd)
1659 bfd *ibfd;
1660 bfd *obfd;
1661 {
1662 flagword old_flags;
1663 flagword new_flags;
1664 boolean error;
1665
1666 /* Check if we have the same endianess. */
1667 if (ibfd->xvec->byteorder != obfd->xvec->byteorder
1668 && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
1669 {
1670 const char *msg;
1671
1672 if (bfd_big_endian (ibfd))
1673 msg = _("%s: compiled for a big endian system and target is little endian");
1674 else
1675 msg = _("%s: compiled for a little endian system and target is big endian");
1676
1677 (*_bfd_error_handler) (msg, bfd_archive_filename (ibfd));
1678
1679 bfd_set_error (bfd_error_wrong_format);
1680 return false;
1681 }
1682
1683 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
1684 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
1685 return true;
1686
1687 new_flags = elf_elfheader (ibfd)->e_flags;
1688 old_flags = elf_elfheader (obfd)->e_flags;
1689 if (!elf_flags_init (obfd))
1690 {
1691 /* First call, no flags set. */
1692 elf_flags_init (obfd) = true;
1693 elf_elfheader (obfd)->e_flags = new_flags;
1694 }
1695
1696 else if (new_flags == old_flags)
1697 /* Compatible flags are ok. */
1698 ;
1699
1700 else
1701 {
1702 /* Incompatible flags. Warn about -mrelocatable mismatch.
1703 Allow -mrelocatable-lib to be linked with either. */
1704 error = false;
1705 if ((new_flags & EF_PPC_RELOCATABLE) != 0
1706 && (old_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0)
1707 {
1708 error = true;
1709 (*_bfd_error_handler)
1710 (_("%s: compiled with -mrelocatable and linked with modules compiled normally"),
1711 bfd_archive_filename (ibfd));
1712 }
1713 else if ((new_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0
1714 && (old_flags & EF_PPC_RELOCATABLE) != 0)
1715 {
1716 error = true;
1717 (*_bfd_error_handler)
1718 (_("%s: compiled normally and linked with modules compiled with -mrelocatable"),
1719 bfd_archive_filename (ibfd));
1720 }
1721
1722 /* The output is -mrelocatable-lib iff both the input files are. */
1723 if (! (new_flags & EF_PPC_RELOCATABLE_LIB))
1724 elf_elfheader (obfd)->e_flags &= ~EF_PPC_RELOCATABLE_LIB;
1725
1726 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
1727 but each input file is either -mrelocatable or -mrelocatable-lib. */
1728 if (! (elf_elfheader (obfd)->e_flags & EF_PPC_RELOCATABLE_LIB)
1729 && (new_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE))
1730 && (old_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE)))
1731 elf_elfheader (obfd)->e_flags |= EF_PPC_RELOCATABLE;
1732
1733 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit
1734 if any module uses it. */
1735 elf_elfheader (obfd)->e_flags |= (new_flags & EF_PPC_EMB);
1736
1737 new_flags &= ~(EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
1738 old_flags &= ~(EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
1739
1740 /* Warn about any other mismatches. */
1741 if (new_flags != old_flags)
1742 {
1743 error = true;
1744 (*_bfd_error_handler)
1745 (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
1746 bfd_archive_filename (ibfd), (long) new_flags, (long) old_flags);
1747 }
1748
1749 if (error)
1750 {
1751 bfd_set_error (bfd_error_bad_value);
1752 return false;
1753 }
1754 }
1755
1756 return true;
1757 }
1758
1759 /* Handle a PowerPC specific section when reading an object file. This
1760 is called when elfcode.h finds a section with an unknown type. */
1761
1762 static boolean
1763 ppc64_elf_section_from_shdr (abfd, hdr, name)
1764 bfd *abfd;
1765 Elf64_Internal_Shdr *hdr;
1766 char *name;
1767 {
1768 asection *newsect;
1769 flagword flags;
1770
1771 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
1772 return false;
1773
1774 newsect = hdr->bfd_section;
1775 flags = bfd_get_section_flags (abfd, newsect);
1776 if (hdr->sh_flags & SHF_EXCLUDE)
1777 flags |= SEC_EXCLUDE;
1778
1779 if (hdr->sh_type == SHT_ORDERED)
1780 flags |= SEC_SORT_ENTRIES;
1781
1782 bfd_set_section_flags (abfd, newsect, flags);
1783 return true;
1784 }
1785 \f
1786 /* The following functions are specific to the ELF linker, while
1787 functions above are used generally. Those named ppc64_elf_* are
1788 called by the main ELF linker code. They appear in this file more
1789 or less in the order in which they are called. eg.
1790 ppc64_elf_check_relocs is called early in the link process,
1791 ppc64_elf_finish_dynamic_sections is one of the last functions
1792 called.
1793
1794 PowerPC64-ELF uses a similar scheme to PowerPC64-XCOFF in that
1795 functions have both a function code symbol and a function descriptor
1796 symbol. A call to foo in a relocatable object file looks like:
1797
1798 . .text
1799 . x:
1800 . bl .foo
1801 . nop
1802
1803 The function definition in another object file might be:
1804
1805 . .section .opd
1806 . foo: .quad .foo
1807 . .quad .TOC.@tocbase
1808 . .quad 0
1809 .
1810 . .text
1811 . .foo: blr
1812
1813 When the linker resolves the call during a static link, the branch
1814 unsurprisingly just goes to .foo and the .opd information is unused.
1815 If the function definition is in a shared library, things are a little
1816 different: The call goes via a plt call stub, the opd information gets
1817 copied to the plt, and the linker patches the nop.
1818
1819 . x:
1820 . bl .foo_stub
1821 . ld 2,40(1)
1822 .
1823 .
1824 . .foo_stub:
1825 . addis 12,2,Lfoo@toc@ha # in practice, the call stub
1826 . addi 12,12,Lfoo@toc@l # is slightly optimised, but
1827 . std 2,40(1) # this is the general idea
1828 . ld 11,0(12)
1829 . ld 2,8(12)
1830 . mtctr 11
1831 . ld 11,16(12)
1832 . bctr
1833 .
1834 . .section .plt
1835 . Lfoo: reloc (R_PPC64_JMP_SLOT, foo)
1836
1837 The "reloc ()" notation is supposed to indicate that the linker emits
1838 an R_PPC64_JMP_SLOT reloc against foo. The dynamic linker does the opd
1839 copying.
1840
1841 What are the difficulties here? Well, firstly, the relocations
1842 examined by the linker in check_relocs are against the function code
1843 sym .foo, while the dynamic relocation in the plt is emitted against
1844 the function descriptor symbol, foo. Somewhere along the line, we need
1845 to carefully copy dynamic link information from one symbol to the other.
1846 Secondly, the generic part of the elf linker will make .foo a dynamic
1847 symbol as is normal for most other backends. We need foo dynamic
1848 instead, at least for an application final link. However, when
1849 creating a shared library containing foo, we need to have both symbols
1850 dynamic so that references to .foo are satisfied during the early
1851 stages of linking. Otherwise the linker might decide to pull in a
1852 definition from some other object, eg. a static library. */
1853
1854 /* The linker needs to keep track of the number of relocs that it
1855 decides to copy as dynamic relocs in check_relocs for each symbol.
1856 This is so that it can later discard them if they are found to be
1857 unnecessary. We store the information in a field extending the
1858 regular ELF linker hash table. */
1859
1860 struct ppc_dyn_relocs
1861 {
1862 struct ppc_dyn_relocs *next;
1863
1864 /* The input section of the reloc. */
1865 asection *sec;
1866
1867 /* Total number of relocs copied for the input section. */
1868 bfd_size_type count;
1869
1870 /* Number of pc-relative relocs copied for the input section. */
1871 bfd_size_type pc_count;
1872 };
1873
1874 /* Of those relocs that might be copied as dynamic relocs, this macro
1875 selects between relative and absolute types. */
1876
1877 #define IS_ABSOLUTE_RELOC(RTYPE) \
1878 ((RTYPE) != R_PPC64_REL32 \
1879 && (RTYPE) != R_PPC64_REL64 \
1880 && (RTYPE) != R_PPC64_ADDR30)
1881
1882 /* Section name for stubs is the associated section name plus this
1883 string. */
1884 #define STUB_SUFFIX ".stub"
1885
1886 /* Linker stubs.
1887 ppc_stub_long_branch:
1888 Used when a 14 bit branch (or even a 24 bit branch) can't reach its
1889 destination, but a 24 bit branch in a stub section will reach.
1890 . b dest
1891
1892 ppc_stub_plt_branch:
1893 Similar to the above, but a 24 bit branch in the stub section won't
1894 reach its destination.
1895 . addis %r12,%r2,xxx@ha
1896 . ld %r11,xxx@l(%r12)
1897 . mtctr %r11
1898 . bctr
1899
1900 ppc_stub_plt_call:
1901 Used to call a function in a shared library.
1902 . addis %r12,%r2,xxx@ha
1903 . std %r2,40(%r1)
1904 . ld %r11,xxx+0@l(%r12)
1905 . ld %r2,xxx+8@l(%r12)
1906 . mtctr %r11
1907 . ld %r11,xxx+16@l(%r12)
1908 . bctr
1909 */
1910
1911 enum ppc_stub_type {
1912 ppc_stub_none,
1913 ppc_stub_long_branch,
1914 ppc_stub_plt_branch,
1915 ppc_stub_plt_call
1916 };
1917
1918 struct ppc_stub_hash_entry {
1919
1920 /* Base hash table entry structure. */
1921 struct bfd_hash_entry root;
1922
1923 /* The stub section. */
1924 asection *stub_sec;
1925
1926 /* Offset within stub_sec of the beginning of this stub. */
1927 bfd_vma stub_offset;
1928
1929 /* Given the symbol's value and its section we can determine its final
1930 value when building the stubs (so the stub knows where to jump. */
1931 bfd_vma target_value;
1932 asection *target_section;
1933
1934 enum ppc_stub_type stub_type;
1935
1936 /* The symbol table entry, if any, that this was derived from. */
1937 struct ppc_link_hash_entry *h;
1938
1939 /* Where this stub is being called from, or, in the case of combined
1940 stub sections, the first input section in the group. */
1941 asection *id_sec;
1942 };
1943
1944 struct ppc_branch_hash_entry {
1945
1946 /* Base hash table entry structure. */
1947 struct bfd_hash_entry root;
1948
1949 /* Offset within .branch_lt. */
1950 unsigned int offset;
1951
1952 /* Generation marker. */
1953 unsigned int iter;
1954 };
1955
1956 struct ppc_link_hash_entry
1957 {
1958 struct elf_link_hash_entry elf;
1959
1960 /* A pointer to the most recently used stub hash entry against this
1961 symbol. */
1962 struct ppc_stub_hash_entry *stub_cache;
1963
1964 /* Track dynamic relocs copied for this symbol. */
1965 struct ppc_dyn_relocs *dyn_relocs;
1966
1967 /* Link between function code and descriptor symbols. */
1968 struct elf_link_hash_entry *oh;
1969
1970 /* Flag function code and descriptor symbols. */
1971 unsigned int is_func:1;
1972 unsigned int is_func_descriptor:1;
1973 };
1974
1975 /* ppc64 ELF linker hash table. */
1976
1977 struct ppc_link_hash_table
1978 {
1979 struct elf_link_hash_table elf;
1980
1981 /* The stub hash table. */
1982 struct bfd_hash_table stub_hash_table;
1983
1984 /* Another hash table for plt_branch stubs. */
1985 struct bfd_hash_table branch_hash_table;
1986
1987 /* Linker stub bfd. */
1988 bfd *stub_bfd;
1989
1990 /* Linker call-backs. */
1991 asection * (*add_stub_section) PARAMS ((const char *, asection *));
1992 void (*layout_sections_again) PARAMS ((void));
1993
1994 /* Array to keep track of which stub sections have been created, and
1995 information on stub grouping. */
1996 struct map_stub {
1997 /* This is the section to which stubs in the group will be attached. */
1998 asection *link_sec;
1999 /* The stub section. */
2000 asection *stub_sec;
2001 } *stub_group;
2002
2003 /* Assorted information used by ppc64_elf_size_stubs. */
2004 unsigned int bfd_count;
2005 int top_index;
2006 asection **input_list;
2007 Elf_Internal_Sym **all_local_syms;
2008
2009 /* Short-cuts to get to dynamic linker sections. */
2010 asection *sgot;
2011 asection *srelgot;
2012 asection *splt;
2013 asection *srelplt;
2014 asection *sdynbss;
2015 asection *srelbss;
2016 asection *sglink;
2017 asection *sfpr;
2018 asection *sbrlt;
2019 asection *srelbrlt;
2020
2021 /* Set on error. */
2022 unsigned int stub_error;
2023
2024 /* Flag set when small branches are detected. Used to
2025 select suitable defaults for the stub group size. */
2026 unsigned int has_14bit_branch;
2027
2028 /* Set if we detect a reference undefined weak symbol. */
2029 unsigned int have_undefweak;
2030
2031 /* Incremented every time we size stubs. */
2032 unsigned int stub_iteration;
2033
2034 /* Small local sym to section mapping cache. */
2035 struct sym_sec_cache sym_sec;
2036 };
2037
2038 static struct bfd_hash_entry *stub_hash_newfunc
2039 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
2040 static struct bfd_hash_entry *branch_hash_newfunc
2041 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
2042 static struct bfd_hash_entry *link_hash_newfunc
2043 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
2044 static struct bfd_link_hash_table *ppc64_elf_link_hash_table_create
2045 PARAMS ((bfd *));
2046 static void ppc64_elf_link_hash_table_free
2047 PARAMS ((struct bfd_link_hash_table *));
2048 static char *ppc_stub_name
2049 PARAMS ((const asection *, const asection *,
2050 const struct ppc_link_hash_entry *, const Elf_Internal_Rela *));
2051 static struct ppc_stub_hash_entry *ppc_get_stub_entry
2052 PARAMS ((const asection *, const asection *, struct elf_link_hash_entry *,
2053 const Elf_Internal_Rela *, struct ppc_link_hash_table *));
2054 static struct ppc_stub_hash_entry *ppc_add_stub
2055 PARAMS ((const char *, asection *, struct ppc_link_hash_table *));
2056 static boolean create_linkage_sections
2057 PARAMS ((bfd *, struct bfd_link_info *));
2058 static boolean create_got_section
2059 PARAMS ((bfd *, struct bfd_link_info *));
2060 static boolean ppc64_elf_create_dynamic_sections
2061 PARAMS ((bfd *, struct bfd_link_info *));
2062 static void ppc64_elf_copy_indirect_symbol
2063 PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *));
2064 static boolean ppc64_elf_check_relocs
2065 PARAMS ((bfd *, struct bfd_link_info *, asection *,
2066 const Elf_Internal_Rela *));
2067 static asection * ppc64_elf_gc_mark_hook
2068 PARAMS ((bfd *abfd, struct bfd_link_info *info, Elf_Internal_Rela *rel,
2069 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym));
2070 static boolean ppc64_elf_gc_sweep_hook
2071 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *sec,
2072 const Elf_Internal_Rela *relocs));
2073 static boolean func_desc_adjust
2074 PARAMS ((struct elf_link_hash_entry *, PTR));
2075 static boolean ppc64_elf_func_desc_adjust
2076 PARAMS ((bfd *, struct bfd_link_info *));
2077 static boolean ppc64_elf_adjust_dynamic_symbol
2078 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
2079 static void ppc64_elf_hide_symbol
2080 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *, boolean));
2081 static boolean allocate_dynrelocs
2082 PARAMS ((struct elf_link_hash_entry *, PTR));
2083 static boolean readonly_dynrelocs
2084 PARAMS ((struct elf_link_hash_entry *, PTR));
2085 static enum elf_reloc_type_class ppc64_elf_reloc_type_class
2086 PARAMS ((const Elf_Internal_Rela *));
2087 static boolean ppc64_elf_size_dynamic_sections
2088 PARAMS ((bfd *, struct bfd_link_info *));
2089 static INLINE enum ppc_stub_type ppc_type_of_stub
2090 PARAMS ((asection *, const Elf_Internal_Rela *,
2091 struct ppc_link_hash_entry **, bfd_vma));
2092 static bfd_byte *build_plt_stub
2093 PARAMS ((bfd *, bfd_byte *, int, int));
2094 static boolean ppc_build_one_stub
2095 PARAMS ((struct bfd_hash_entry *, PTR));
2096 static boolean ppc_size_one_stub
2097 PARAMS ((struct bfd_hash_entry *, PTR));
2098 static void group_sections
2099 PARAMS ((struct ppc_link_hash_table *, bfd_size_type, boolean));
2100 static boolean get_local_syms
2101 PARAMS ((bfd *, struct ppc_link_hash_table *));
2102 static boolean ppc64_elf_fake_sections
2103 PARAMS ((bfd *, Elf64_Internal_Shdr *, asection *));
2104 static boolean ppc64_elf_relocate_section
2105 PARAMS ((bfd *, struct bfd_link_info *info, bfd *, asection *, bfd_byte *,
2106 Elf_Internal_Rela *relocs, Elf_Internal_Sym *local_syms,
2107 asection **));
2108 static boolean ppc64_elf_finish_dynamic_symbol
2109 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
2110 Elf_Internal_Sym *));
2111 static boolean ppc64_elf_finish_dynamic_sections
2112 PARAMS ((bfd *, struct bfd_link_info *));
2113
2114 /* Get the ppc64 ELF linker hash table from a link_info structure. */
2115
2116 #define ppc_hash_table(p) \
2117 ((struct ppc_link_hash_table *) ((p)->hash))
2118
2119 #define ppc_stub_hash_lookup(table, string, create, copy) \
2120 ((struct ppc_stub_hash_entry *) \
2121 bfd_hash_lookup ((table), (string), (create), (copy)))
2122
2123 #define ppc_branch_hash_lookup(table, string, create, copy) \
2124 ((struct ppc_branch_hash_entry *) \
2125 bfd_hash_lookup ((table), (string), (create), (copy)))
2126
2127 /* Create an entry in the stub hash table. */
2128
2129 static struct bfd_hash_entry *
2130 stub_hash_newfunc (entry, table, string)
2131 struct bfd_hash_entry *entry;
2132 struct bfd_hash_table *table;
2133 const char *string;
2134 {
2135 /* Allocate the structure if it has not already been allocated by a
2136 subclass. */
2137 if (entry == NULL)
2138 {
2139 entry = bfd_hash_allocate (table, sizeof (struct ppc_stub_hash_entry));
2140 if (entry == NULL)
2141 return entry;
2142 }
2143
2144 /* Call the allocation method of the superclass. */
2145 entry = bfd_hash_newfunc (entry, table, string);
2146 if (entry != NULL)
2147 {
2148 struct ppc_stub_hash_entry *eh;
2149
2150 /* Initialize the local fields. */
2151 eh = (struct ppc_stub_hash_entry *) entry;
2152 eh->stub_sec = NULL;
2153 eh->stub_offset = 0;
2154 eh->target_value = 0;
2155 eh->target_section = NULL;
2156 eh->stub_type = ppc_stub_none;
2157 eh->h = NULL;
2158 eh->id_sec = NULL;
2159 }
2160
2161 return entry;
2162 }
2163
2164 /* Create an entry in the branch hash table. */
2165
2166 static struct bfd_hash_entry *
2167 branch_hash_newfunc (entry, table, string)
2168 struct bfd_hash_entry *entry;
2169 struct bfd_hash_table *table;
2170 const char *string;
2171 {
2172 /* Allocate the structure if it has not already been allocated by a
2173 subclass. */
2174 if (entry == NULL)
2175 {
2176 entry = bfd_hash_allocate (table, sizeof (struct ppc_branch_hash_entry));
2177 if (entry == NULL)
2178 return entry;
2179 }
2180
2181 /* Call the allocation method of the superclass. */
2182 entry = bfd_hash_newfunc (entry, table, string);
2183 if (entry != NULL)
2184 {
2185 struct ppc_branch_hash_entry *eh;
2186
2187 /* Initialize the local fields. */
2188 eh = (struct ppc_branch_hash_entry *) entry;
2189 eh->offset = 0;
2190 eh->iter = 0;
2191 }
2192
2193 return entry;
2194 }
2195
2196 /* Create an entry in a ppc64 ELF linker hash table. */
2197
2198 static struct bfd_hash_entry *
2199 link_hash_newfunc (entry, table, string)
2200 struct bfd_hash_entry *entry;
2201 struct bfd_hash_table *table;
2202 const char *string;
2203 {
2204 /* Allocate the structure if it has not already been allocated by a
2205 subclass. */
2206 if (entry == NULL)
2207 {
2208 entry = bfd_hash_allocate (table, sizeof (struct ppc_link_hash_entry));
2209 if (entry == NULL)
2210 return entry;
2211 }
2212
2213 /* Call the allocation method of the superclass. */
2214 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
2215 if (entry != NULL)
2216 {
2217 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) entry;
2218
2219 eh->stub_cache = NULL;
2220 eh->dyn_relocs = NULL;
2221 eh->oh = NULL;
2222 eh->is_func = 0;
2223 eh->is_func_descriptor = 0;
2224 }
2225
2226 return entry;
2227 }
2228
2229 /* Create a ppc64 ELF linker hash table. */
2230
2231 static struct bfd_link_hash_table *
2232 ppc64_elf_link_hash_table_create (abfd)
2233 bfd *abfd;
2234 {
2235 struct ppc_link_hash_table *htab;
2236 bfd_size_type amt = sizeof (struct ppc_link_hash_table);
2237
2238 htab = (struct ppc_link_hash_table *) bfd_malloc (amt);
2239 if (htab == NULL)
2240 return NULL;
2241
2242 if (! _bfd_elf_link_hash_table_init (&htab->elf, abfd, link_hash_newfunc))
2243 {
2244 free (htab);
2245 return NULL;
2246 }
2247
2248 /* Init the stub hash table too. */
2249 if (!bfd_hash_table_init (&htab->stub_hash_table, stub_hash_newfunc))
2250 return NULL;
2251
2252 /* And the branch hash table. */
2253 if (!bfd_hash_table_init (&htab->branch_hash_table, branch_hash_newfunc))
2254 return NULL;
2255
2256 htab->stub_bfd = NULL;
2257 htab->add_stub_section = NULL;
2258 htab->layout_sections_again = NULL;
2259 htab->stub_group = NULL;
2260 htab->sgot = NULL;
2261 htab->srelgot = NULL;
2262 htab->splt = NULL;
2263 htab->srelplt = NULL;
2264 htab->sdynbss = NULL;
2265 htab->srelbss = NULL;
2266 htab->sglink = NULL;
2267 htab->sfpr = NULL;
2268 htab->sbrlt = NULL;
2269 htab->srelbrlt = NULL;
2270 htab->stub_error = 0;
2271 htab->has_14bit_branch = 0;
2272 htab->have_undefweak = 0;
2273 htab->stub_iteration = 0;
2274 htab->sym_sec.abfd = NULL;
2275
2276 return &htab->elf.root;
2277 }
2278
2279 /* Free the derived linker hash table. */
2280
2281 static void
2282 ppc64_elf_link_hash_table_free (hash)
2283 struct bfd_link_hash_table *hash;
2284 {
2285 struct ppc_link_hash_table *ret = (struct ppc_link_hash_table *) hash;
2286
2287 bfd_hash_table_free (&ret->stub_hash_table);
2288 bfd_hash_table_free (&ret->branch_hash_table);
2289 _bfd_generic_link_hash_table_free (hash);
2290 }
2291
2292 /* Build a name for an entry in the stub hash table. */
2293
2294 static char *
2295 ppc_stub_name (input_section, sym_sec, h, rel)
2296 const asection *input_section;
2297 const asection *sym_sec;
2298 const struct ppc_link_hash_entry *h;
2299 const Elf_Internal_Rela *rel;
2300 {
2301 char *stub_name;
2302 bfd_size_type len;
2303
2304 /* rel->r_addend is actually 64 bit, but who uses more than +/- 2^31
2305 offsets from a sym as a branch target? In fact, we could
2306 probably assume the addend is always zero. */
2307 BFD_ASSERT (((int) rel->r_addend & 0xffffffff) == rel->r_addend);
2308
2309 if (h)
2310 {
2311 len = 8 + 1 + strlen (h->elf.root.root.string) + 1 + 8 + 1;
2312 stub_name = bfd_malloc (len);
2313 if (stub_name != NULL)
2314 {
2315 sprintf (stub_name, "%08x_%s+%x",
2316 input_section->id & 0xffffffff,
2317 h->elf.root.root.string,
2318 (int) rel->r_addend & 0xffffffff);
2319 }
2320 }
2321 else
2322 {
2323 len = 8 + 1 + 8 + 1 + 8 + 1 + 16 + 1;
2324 stub_name = bfd_malloc (len);
2325 if (stub_name != NULL)
2326 {
2327 sprintf (stub_name, "%08x_%x:%x+%x",
2328 input_section->id & 0xffffffff,
2329 sym_sec->id & 0xffffffff,
2330 (int) ELF64_R_SYM (rel->r_info) & 0xffffffff,
2331 (int) rel->r_addend & 0xffffffff);
2332 }
2333 }
2334 return stub_name;
2335 }
2336
2337 /* Look up an entry in the stub hash. Stub entries are cached because
2338 creating the stub name takes a bit of time. */
2339
2340 static struct ppc_stub_hash_entry *
2341 ppc_get_stub_entry (input_section, sym_sec, hash, rel, htab)
2342 const asection *input_section;
2343 const asection *sym_sec;
2344 struct elf_link_hash_entry *hash;
2345 const Elf_Internal_Rela *rel;
2346 struct ppc_link_hash_table *htab;
2347 {
2348 struct ppc_stub_hash_entry *stub_entry;
2349 struct ppc_link_hash_entry *h = (struct ppc_link_hash_entry *) hash;
2350 const asection *id_sec;
2351
2352 /* If this input section is part of a group of sections sharing one
2353 stub section, then use the id of the first section in the group.
2354 Stub names need to include a section id, as there may well be
2355 more than one stub used to reach say, printf, and we need to
2356 distinguish between them. */
2357 id_sec = htab->stub_group[input_section->id].link_sec;
2358
2359 if (h != NULL && h->stub_cache != NULL
2360 && h->stub_cache->h == h
2361 && h->stub_cache->id_sec == id_sec)
2362 {
2363 stub_entry = h->stub_cache;
2364 }
2365 else
2366 {
2367 char *stub_name;
2368
2369 stub_name = ppc_stub_name (id_sec, sym_sec, h, rel);
2370 if (stub_name == NULL)
2371 return NULL;
2372
2373 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table,
2374 stub_name, false, false);
2375 if (h != NULL)
2376 h->stub_cache = stub_entry;
2377
2378 free (stub_name);
2379 }
2380
2381 return stub_entry;
2382 }
2383
2384 /* Add a new stub entry to the stub hash. Not all fields of the new
2385 stub entry are initialised. */
2386
2387 static struct ppc_stub_hash_entry *
2388 ppc_add_stub (stub_name, section, htab)
2389 const char *stub_name;
2390 asection *section;
2391 struct ppc_link_hash_table *htab;
2392 {
2393 asection *link_sec;
2394 asection *stub_sec;
2395 struct ppc_stub_hash_entry *stub_entry;
2396
2397 link_sec = htab->stub_group[section->id].link_sec;
2398 stub_sec = htab->stub_group[section->id].stub_sec;
2399 if (stub_sec == NULL)
2400 {
2401 stub_sec = htab->stub_group[link_sec->id].stub_sec;
2402 if (stub_sec == NULL)
2403 {
2404 bfd_size_type len;
2405 char *s_name;
2406
2407 len = strlen (link_sec->name) + sizeof (STUB_SUFFIX);
2408 s_name = bfd_alloc (htab->stub_bfd, len);
2409 if (s_name == NULL)
2410 return NULL;
2411
2412 strcpy (s_name, link_sec->name);
2413 strcpy (s_name + len - sizeof (STUB_SUFFIX), STUB_SUFFIX);
2414 stub_sec = (*htab->add_stub_section) (s_name, link_sec);
2415 if (stub_sec == NULL)
2416 return NULL;
2417 htab->stub_group[link_sec->id].stub_sec = stub_sec;
2418 }
2419 htab->stub_group[section->id].stub_sec = stub_sec;
2420 }
2421
2422 /* Enter this entry into the linker stub hash table. */
2423 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, stub_name,
2424 true, false);
2425 if (stub_entry == NULL)
2426 {
2427 (*_bfd_error_handler) (_("%s: cannot create stub entry %s"),
2428 bfd_archive_filename (section->owner),
2429 stub_name);
2430 return NULL;
2431 }
2432
2433 stub_entry->stub_sec = stub_sec;
2434 stub_entry->stub_offset = 0;
2435 stub_entry->id_sec = link_sec;
2436 return stub_entry;
2437 }
2438
2439 /* Create sections for linker generated code. */
2440
2441 static boolean
2442 create_linkage_sections (dynobj, info)
2443 bfd *dynobj;
2444 struct bfd_link_info *info;
2445 {
2446 struct ppc_link_hash_table *htab;
2447 flagword flags;
2448
2449 htab = ppc_hash_table (info);
2450
2451 /* Create .sfpr for code to save and restore fp regs. */
2452 flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_READONLY
2453 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2454 htab->sfpr = bfd_make_section_anyway (dynobj, ".sfpr");
2455 if (htab->sfpr == NULL
2456 || ! bfd_set_section_flags (dynobj, htab->sfpr, flags)
2457 || ! bfd_set_section_alignment (dynobj, htab->sfpr, 2))
2458 return false;
2459
2460 /* Create .glink for lazy dynamic linking support. */
2461 htab->sglink = bfd_make_section_anyway (dynobj, ".glink");
2462 if (htab->sglink == NULL
2463 || ! bfd_set_section_flags (dynobj, htab->sglink, flags)
2464 || ! bfd_set_section_alignment (dynobj, htab->sglink, 2))
2465 return false;
2466
2467 /* Create .branch_lt for plt_branch stubs. */
2468 flags = (SEC_ALLOC | SEC_LOAD
2469 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2470 htab->sbrlt = bfd_make_section_anyway (dynobj, ".branch_lt");
2471 if (htab->sbrlt == NULL
2472 || ! bfd_set_section_flags (dynobj, htab->sbrlt, flags)
2473 || ! bfd_set_section_alignment (dynobj, htab->sbrlt, 3))
2474 return false;
2475
2476 if (info->shared)
2477 {
2478 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
2479 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2480 htab->srelbrlt = bfd_make_section (dynobj, ".rela.branch_lt");
2481 if (!htab->srelbrlt
2482 || ! bfd_set_section_flags (dynobj, htab->srelbrlt, flags)
2483 || ! bfd_set_section_alignment (dynobj, htab->srelbrlt, 3))
2484 return false;
2485 }
2486 return true;
2487 }
2488
2489 /* Create .got and .rela.got sections in DYNOBJ, and set up
2490 shortcuts to them in our hash table. */
2491
2492 static boolean
2493 create_got_section (dynobj, info)
2494 bfd *dynobj;
2495 struct bfd_link_info *info;
2496 {
2497 struct ppc_link_hash_table *htab;
2498
2499 if (! _bfd_elf_create_got_section (dynobj, info))
2500 return false;
2501
2502 htab = ppc_hash_table (info);
2503 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
2504 if (!htab->sgot)
2505 abort ();
2506
2507 htab->srelgot = bfd_make_section (dynobj, ".rela.got");
2508 if (!htab->srelgot
2509 || ! bfd_set_section_flags (dynobj, htab->srelgot,
2510 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
2511 | SEC_IN_MEMORY | SEC_LINKER_CREATED
2512 | SEC_READONLY))
2513 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
2514 return false;
2515 return true;
2516 }
2517
2518 /* Create the dynamic sections, and set up shortcuts. */
2519
2520 static boolean
2521 ppc64_elf_create_dynamic_sections (dynobj, info)
2522 bfd *dynobj;
2523 struct bfd_link_info *info;
2524 {
2525 struct ppc_link_hash_table *htab;
2526
2527 htab = ppc_hash_table (info);
2528 if (!htab->sgot && !create_got_section (dynobj, info))
2529 return false;
2530
2531 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
2532 return false;
2533
2534 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
2535 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2536 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
2537 if (!info->shared)
2538 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
2539
2540 if (!htab->splt || !htab->srelplt || !htab->sdynbss
2541 || (!info->shared && !htab->srelbss))
2542 abort ();
2543
2544 return true;
2545 }
2546
2547 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2548
2549 static void
2550 ppc64_elf_copy_indirect_symbol (dir, ind)
2551 struct elf_link_hash_entry *dir, *ind;
2552 {
2553 struct ppc_link_hash_entry *edir, *eind;
2554
2555 edir = (struct ppc_link_hash_entry *) dir;
2556 eind = (struct ppc_link_hash_entry *) ind;
2557
2558 if (eind->dyn_relocs != NULL)
2559 {
2560 if (edir->dyn_relocs != NULL)
2561 {
2562 struct ppc_dyn_relocs **pp;
2563 struct ppc_dyn_relocs *p;
2564
2565 if (ind->root.type == bfd_link_hash_indirect)
2566 abort ();
2567
2568 /* Add reloc counts against the weak sym to the strong sym
2569 list. Merge any entries against the same section. */
2570 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
2571 {
2572 struct ppc_dyn_relocs *q;
2573
2574 for (q = edir->dyn_relocs; q != NULL; q = q->next)
2575 if (q->sec == p->sec)
2576 {
2577 q->pc_count += p->pc_count;
2578 q->count += p->count;
2579 *pp = p->next;
2580 break;
2581 }
2582 if (q == NULL)
2583 pp = &p->next;
2584 }
2585 *pp = edir->dyn_relocs;
2586 }
2587
2588 edir->dyn_relocs = eind->dyn_relocs;
2589 eind->dyn_relocs = NULL;
2590 }
2591
2592 edir->is_func |= eind->is_func;
2593 edir->is_func_descriptor |= eind->is_func_descriptor;
2594
2595 _bfd_elf_link_hash_copy_indirect (dir, ind);
2596 }
2597
2598 /* Look through the relocs for a section during the first phase, and
2599 calculate needed space in the global offset table, procedure
2600 linkage table, and dynamic reloc sections. */
2601
2602 static boolean
2603 ppc64_elf_check_relocs (abfd, info, sec, relocs)
2604 bfd *abfd;
2605 struct bfd_link_info *info;
2606 asection *sec;
2607 const Elf_Internal_Rela *relocs;
2608 {
2609 struct ppc_link_hash_table *htab;
2610 Elf_Internal_Shdr *symtab_hdr;
2611 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
2612 const Elf_Internal_Rela *rel;
2613 const Elf_Internal_Rela *rel_end;
2614 asection *sreloc;
2615 boolean is_opd;
2616
2617 if (info->relocateable)
2618 return true;
2619
2620 htab = ppc_hash_table (info);
2621 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2622
2623 sym_hashes = elf_sym_hashes (abfd);
2624 sym_hashes_end = (sym_hashes
2625 + symtab_hdr->sh_size / sizeof (Elf64_External_Sym));
2626 if (!elf_bad_symtab (abfd))
2627 sym_hashes_end -= symtab_hdr->sh_info;
2628
2629 sreloc = NULL;
2630 is_opd = strcmp (bfd_get_section_name (abfd, sec), ".opd") == 0;
2631
2632 if (htab->elf.dynobj == NULL)
2633 htab->elf.dynobj = abfd;
2634 if (htab->sfpr == NULL
2635 && !create_linkage_sections (htab->elf.dynobj, info))
2636 return false;
2637
2638 rel_end = relocs + sec->reloc_count;
2639 for (rel = relocs; rel < rel_end; rel++)
2640 {
2641 unsigned long r_symndx;
2642 struct elf_link_hash_entry *h;
2643 enum elf_ppc_reloc_type r_type;
2644
2645 r_symndx = ELF64_R_SYM (rel->r_info);
2646 if (r_symndx < symtab_hdr->sh_info)
2647 h = NULL;
2648 else
2649 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2650
2651 r_type = (enum elf_ppc_reloc_type) ELF64_R_TYPE (rel->r_info);
2652 switch (r_type)
2653 {
2654 /* GOT16 relocations */
2655 case R_PPC64_GOT16:
2656 case R_PPC64_GOT16_DS:
2657 case R_PPC64_GOT16_HA:
2658 case R_PPC64_GOT16_HI:
2659 case R_PPC64_GOT16_LO:
2660 case R_PPC64_GOT16_LO_DS:
2661
2662 /* This symbol requires a global offset table entry. */
2663 if (htab->sgot == NULL
2664 && !create_got_section (htab->elf.dynobj, info))
2665 return false;
2666
2667 if (h != NULL)
2668 {
2669 h->got.refcount += 1;
2670 }
2671 else
2672 {
2673 bfd_signed_vma *local_got_refcounts;
2674
2675 /* This is a global offset table entry for a local symbol. */
2676 local_got_refcounts = elf_local_got_refcounts (abfd);
2677 if (local_got_refcounts == NULL)
2678 {
2679 bfd_size_type size;
2680
2681 size = symtab_hdr->sh_info;
2682 size *= sizeof (bfd_signed_vma);
2683 local_got_refcounts = ((bfd_signed_vma *)
2684 bfd_zalloc (abfd, size));
2685 if (local_got_refcounts == NULL)
2686 return false;
2687 elf_local_got_refcounts (abfd) = local_got_refcounts;
2688 }
2689 local_got_refcounts[r_symndx] += 1;
2690 }
2691 break;
2692
2693 case R_PPC64_PLT16_HA:
2694 case R_PPC64_PLT16_HI:
2695 case R_PPC64_PLT16_LO:
2696 case R_PPC64_PLT32:
2697 case R_PPC64_PLT64:
2698 /* This symbol requires a procedure linkage table entry. We
2699 actually build the entry in adjust_dynamic_symbol,
2700 because this might be a case of linking PIC code without
2701 linking in any dynamic objects, in which case we don't
2702 need to generate a procedure linkage table after all. */
2703 if (h == NULL)
2704 {
2705 /* It does not make sense to have a procedure linkage
2706 table entry for a local symbol. */
2707 bfd_set_error (bfd_error_bad_value);
2708 return false;
2709 }
2710
2711 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
2712 h->plt.refcount += 1;
2713 ((struct ppc_link_hash_entry *) h)->is_func = 1;
2714 break;
2715
2716 /* The following relocations don't need to propagate the
2717 relocation if linking a shared object since they are
2718 section relative. */
2719 case R_PPC64_SECTOFF:
2720 case R_PPC64_SECTOFF_LO:
2721 case R_PPC64_SECTOFF_HI:
2722 case R_PPC64_SECTOFF_HA:
2723 case R_PPC64_SECTOFF_DS:
2724 case R_PPC64_SECTOFF_LO_DS:
2725 case R_PPC64_TOC16:
2726 case R_PPC64_TOC16_LO:
2727 case R_PPC64_TOC16_HI:
2728 case R_PPC64_TOC16_HA:
2729 case R_PPC64_TOC16_DS:
2730 case R_PPC64_TOC16_LO_DS:
2731 break;
2732
2733 /* This relocation describes the C++ object vtable hierarchy.
2734 Reconstruct it for later use during GC. */
2735 case R_PPC64_GNU_VTINHERIT:
2736 if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2737 return false;
2738 break;
2739
2740 /* This relocation describes which C++ vtable entries are actually
2741 used. Record for later use during GC. */
2742 case R_PPC64_GNU_VTENTRY:
2743 if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2744 return false;
2745 break;
2746
2747 case R_PPC64_REL14:
2748 case R_PPC64_REL14_BRTAKEN:
2749 case R_PPC64_REL14_BRNTAKEN:
2750 htab->has_14bit_branch = 1;
2751 /* Fall through. */
2752
2753 case R_PPC64_REL24:
2754 if (h != NULL
2755 && h->root.root.string[0] == '.'
2756 && h->root.root.string[1] != 0)
2757 {
2758 /* We may need a .plt entry if the function this reloc
2759 refers to is in a shared lib. */
2760 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
2761 h->plt.refcount += 1;
2762 ((struct ppc_link_hash_entry *) h)->is_func = 1;
2763 }
2764 break;
2765
2766 case R_PPC64_ADDR64:
2767 if (is_opd
2768 && h != NULL
2769 && h->root.root.string[0] == '.'
2770 && h->root.root.string[1] != 0)
2771 {
2772 struct elf_link_hash_entry *fdh;
2773
2774 fdh = elf_link_hash_lookup (&htab->elf, h->root.root.string + 1,
2775 false, false, false);
2776 if (fdh != NULL)
2777 {
2778 /* Ensure the function descriptor symbol string is
2779 part of the code symbol string. We aren't
2780 changing the name here, just allowing some tricks
2781 in ppc64_elf_hide_symbol. */
2782 fdh->root.root.string = h->root.root.string + 1;
2783 ((struct ppc_link_hash_entry *) fdh)->is_func_descriptor = 1;
2784 ((struct ppc_link_hash_entry *) fdh)->oh = h;
2785 ((struct ppc_link_hash_entry *) h)->is_func = 1;
2786 ((struct ppc_link_hash_entry *) h)->oh = fdh;
2787 }
2788 }
2789 /* Fall through. */
2790
2791 case R_PPC64_REL64:
2792 case R_PPC64_REL32:
2793 case R_PPC64_ADDR14:
2794 case R_PPC64_ADDR14_BRNTAKEN:
2795 case R_PPC64_ADDR14_BRTAKEN:
2796 case R_PPC64_ADDR16:
2797 case R_PPC64_ADDR16_DS:
2798 case R_PPC64_ADDR16_HA:
2799 case R_PPC64_ADDR16_HI:
2800 case R_PPC64_ADDR16_HIGHER:
2801 case R_PPC64_ADDR16_HIGHERA:
2802 case R_PPC64_ADDR16_HIGHEST:
2803 case R_PPC64_ADDR16_HIGHESTA:
2804 case R_PPC64_ADDR16_LO:
2805 case R_PPC64_ADDR16_LO_DS:
2806 case R_PPC64_ADDR24:
2807 case R_PPC64_ADDR30:
2808 case R_PPC64_ADDR32:
2809 case R_PPC64_UADDR16:
2810 case R_PPC64_UADDR32:
2811 case R_PPC64_UADDR64:
2812 case R_PPC64_TOC:
2813 /* Don't propagate .opd relocs. */
2814 if (NO_OPD_RELOCS && is_opd)
2815 break;
2816
2817 /* If we are creating a shared library, and this is a reloc
2818 against a global symbol, or a non PC relative reloc
2819 against a local symbol, then we need to copy the reloc
2820 into the shared library. However, if we are linking with
2821 -Bsymbolic, we do not need to copy a reloc against a
2822 global symbol which is defined in an object we are
2823 including in the link (i.e., DEF_REGULAR is set). At
2824 this point we have not seen all the input files, so it is
2825 possible that DEF_REGULAR is not set now but will be set
2826 later (it is never cleared). In case of a weak definition,
2827 DEF_REGULAR may be cleared later by a strong definition in
2828 a shared library. We account for that possibility below by
2829 storing information in the relocs_copied field of the hash
2830 table entry. A similar situation occurs when creating
2831 shared libraries and symbol visibility changes render the
2832 symbol local.
2833
2834 If on the other hand, we are creating an executable, we
2835 may need to keep relocations for symbols satisfied by a
2836 dynamic library if we manage to avoid copy relocs for the
2837 symbol. */
2838 if ((info->shared
2839 && (sec->flags & SEC_ALLOC) != 0
2840 && (IS_ABSOLUTE_RELOC (r_type)
2841 || (h != NULL
2842 && (! info->symbolic
2843 || h->root.type == bfd_link_hash_defweak
2844 || (h->elf_link_hash_flags
2845 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
2846 || (!info->shared
2847 && (sec->flags & SEC_ALLOC) != 0
2848 && h != NULL
2849 && (h->root.type == bfd_link_hash_defweak
2850 || (h->elf_link_hash_flags
2851 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
2852 {
2853 struct ppc_dyn_relocs *p;
2854 struct ppc_dyn_relocs **head;
2855
2856 /* We must copy these reloc types into the output file.
2857 Create a reloc section in dynobj and make room for
2858 this reloc. */
2859 if (sreloc == NULL)
2860 {
2861 const char *name;
2862 bfd *dynobj;
2863
2864 name = (bfd_elf_string_from_elf_section
2865 (abfd,
2866 elf_elfheader (abfd)->e_shstrndx,
2867 elf_section_data (sec)->rel_hdr.sh_name));
2868 if (name == NULL)
2869 return false;
2870
2871 if (strncmp (name, ".rela", 5) != 0
2872 || strcmp (bfd_get_section_name (abfd, sec),
2873 name + 5) != 0)
2874 {
2875 (*_bfd_error_handler)
2876 (_("%s: bad relocation section name `%s\'"),
2877 bfd_archive_filename (abfd), name);
2878 bfd_set_error (bfd_error_bad_value);
2879 }
2880
2881 dynobj = htab->elf.dynobj;
2882 sreloc = bfd_get_section_by_name (dynobj, name);
2883 if (sreloc == NULL)
2884 {
2885 flagword flags;
2886
2887 sreloc = bfd_make_section (dynobj, name);
2888 flags = (SEC_HAS_CONTENTS | SEC_READONLY
2889 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2890 if ((sec->flags & SEC_ALLOC) != 0)
2891 flags |= SEC_ALLOC | SEC_LOAD;
2892 if (sreloc == NULL
2893 || ! bfd_set_section_flags (dynobj, sreloc, flags)
2894 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
2895 return false;
2896 }
2897 elf_section_data (sec)->sreloc = sreloc;
2898 }
2899
2900 /* If this is a global symbol, we count the number of
2901 relocations we need for this symbol. */
2902 if (h != NULL)
2903 {
2904 head = &((struct ppc_link_hash_entry *) h)->dyn_relocs;
2905 }
2906 else
2907 {
2908 /* Track dynamic relocs needed for local syms too.
2909 We really need local syms available to do this
2910 easily. Oh well. */
2911
2912 asection *s;
2913 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
2914 sec, r_symndx);
2915 if (s == NULL)
2916 return false;
2917
2918 head = ((struct ppc_dyn_relocs **)
2919 &elf_section_data (s)->local_dynrel);
2920 }
2921
2922 p = *head;
2923 if (p == NULL || p->sec != sec)
2924 {
2925 p = ((struct ppc_dyn_relocs *)
2926 bfd_alloc (htab->elf.dynobj,
2927 (bfd_size_type) sizeof *p));
2928 if (p == NULL)
2929 return false;
2930 p->next = *head;
2931 *head = p;
2932 p->sec = sec;
2933 p->count = 0;
2934 p->pc_count = 0;
2935 }
2936
2937 p->count += 1;
2938 if (!IS_ABSOLUTE_RELOC (r_type))
2939 p->pc_count += 1;
2940 }
2941 break;
2942
2943 default:
2944 break;
2945 }
2946 }
2947
2948 return true;
2949 }
2950
2951 /* Return the section that should be marked against GC for a given
2952 relocation. */
2953
2954 static asection *
2955 ppc64_elf_gc_mark_hook (abfd, info, rel, h, sym)
2956 bfd *abfd;
2957 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2958 Elf_Internal_Rela *rel;
2959 struct elf_link_hash_entry *h;
2960 Elf_Internal_Sym *sym;
2961 {
2962 if (h != NULL)
2963 {
2964 enum elf_ppc_reloc_type r_type;
2965
2966 r_type = (enum elf_ppc_reloc_type) ELF64_R_TYPE (rel->r_info);
2967 switch (r_type)
2968 {
2969 case R_PPC64_GNU_VTINHERIT:
2970 case R_PPC64_GNU_VTENTRY:
2971 break;
2972
2973 default:
2974 switch (h->root.type)
2975 {
2976 case bfd_link_hash_defined:
2977 case bfd_link_hash_defweak:
2978 return h->root.u.def.section;
2979
2980 case bfd_link_hash_common:
2981 return h->root.u.c.p->section;
2982
2983 default:
2984 break;
2985 }
2986 }
2987 }
2988 else
2989 {
2990 return bfd_section_from_elf_index (abfd, sym->st_shndx);
2991 }
2992
2993 return NULL;
2994 }
2995
2996 /* Update the .got, .plt. and dynamic reloc reference counts for the
2997 section being removed. */
2998
2999 static boolean
3000 ppc64_elf_gc_sweep_hook (abfd, info, sec, relocs)
3001 bfd *abfd;
3002 struct bfd_link_info *info ATTRIBUTE_UNUSED;
3003 asection *sec;
3004 const Elf_Internal_Rela *relocs;
3005 {
3006 Elf_Internal_Shdr *symtab_hdr;
3007 struct elf_link_hash_entry **sym_hashes;
3008 bfd_signed_vma *local_got_refcounts;
3009 const Elf_Internal_Rela *rel, *relend;
3010
3011 elf_section_data (sec)->local_dynrel = NULL;
3012
3013 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3014 sym_hashes = elf_sym_hashes (abfd);
3015 local_got_refcounts = elf_local_got_refcounts (abfd);
3016
3017 relend = relocs + sec->reloc_count;
3018 for (rel = relocs; rel < relend; rel++)
3019 {
3020 unsigned long r_symndx;
3021 enum elf_ppc_reloc_type r_type;
3022 struct elf_link_hash_entry *h;
3023
3024 r_symndx = ELF64_R_SYM (rel->r_info);
3025 r_type = (enum elf_ppc_reloc_type) ELF64_R_TYPE (rel->r_info);
3026 switch (r_type)
3027 {
3028 case R_PPC64_GOT16:
3029 case R_PPC64_GOT16_DS:
3030 case R_PPC64_GOT16_HA:
3031 case R_PPC64_GOT16_HI:
3032 case R_PPC64_GOT16_LO:
3033 case R_PPC64_GOT16_LO_DS:
3034 if (r_symndx >= symtab_hdr->sh_info)
3035 {
3036 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3037 if (h->got.refcount > 0)
3038 h->got.refcount--;
3039 }
3040 else
3041 {
3042 if (local_got_refcounts[r_symndx] > 0)
3043 local_got_refcounts[r_symndx]--;
3044 }
3045 break;
3046
3047 case R_PPC64_PLT16_HA:
3048 case R_PPC64_PLT16_HI:
3049 case R_PPC64_PLT16_LO:
3050 case R_PPC64_PLT32:
3051 case R_PPC64_PLT64:
3052 if (r_symndx >= symtab_hdr->sh_info)
3053 {
3054 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3055 if (h->plt.refcount > 0)
3056 h->plt.refcount--;
3057 }
3058 break;
3059
3060 case R_PPC64_REL14:
3061 case R_PPC64_REL14_BRNTAKEN:
3062 case R_PPC64_REL14_BRTAKEN:
3063 case R_PPC64_REL24:
3064 if (r_symndx >= symtab_hdr->sh_info)
3065 {
3066 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3067 if (h->plt.refcount > 0)
3068 h->plt.refcount--;
3069 }
3070 break;
3071
3072 case R_PPC64_REL32:
3073 case R_PPC64_REL64:
3074 if (r_symndx >= symtab_hdr->sh_info)
3075 {
3076 struct ppc_link_hash_entry *eh;
3077 struct ppc_dyn_relocs **pp;
3078 struct ppc_dyn_relocs *p;
3079
3080 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3081 eh = (struct ppc_link_hash_entry *) h;
3082
3083 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
3084 if (p->sec == sec)
3085 {
3086 p->pc_count -= 1;
3087 p->count -= 1;
3088 if (p->count == 0)
3089 *pp = p->next;
3090 break;
3091 }
3092 }
3093 break;
3094
3095 case R_PPC64_ADDR14:
3096 case R_PPC64_ADDR14_BRNTAKEN:
3097 case R_PPC64_ADDR14_BRTAKEN:
3098 case R_PPC64_ADDR16:
3099 case R_PPC64_ADDR16_DS:
3100 case R_PPC64_ADDR16_HA:
3101 case R_PPC64_ADDR16_HI:
3102 case R_PPC64_ADDR16_HIGHER:
3103 case R_PPC64_ADDR16_HIGHERA:
3104 case R_PPC64_ADDR16_HIGHEST:
3105 case R_PPC64_ADDR16_HIGHESTA:
3106 case R_PPC64_ADDR16_LO:
3107 case R_PPC64_ADDR16_LO_DS:
3108 case R_PPC64_ADDR24:
3109 case R_PPC64_ADDR30:
3110 case R_PPC64_ADDR32:
3111 case R_PPC64_ADDR64:
3112 case R_PPC64_UADDR16:
3113 case R_PPC64_UADDR32:
3114 case R_PPC64_UADDR64:
3115 case R_PPC64_TOC:
3116 if (r_symndx >= symtab_hdr->sh_info)
3117 {
3118 struct ppc_link_hash_entry *eh;
3119 struct ppc_dyn_relocs **pp;
3120 struct ppc_dyn_relocs *p;
3121
3122 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3123 eh = (struct ppc_link_hash_entry *) h;
3124
3125 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
3126 if (p->sec == sec)
3127 {
3128 p->count -= 1;
3129 if (p->count == 0)
3130 *pp = p->next;
3131 break;
3132 }
3133 }
3134 break;
3135
3136 default:
3137 break;
3138 }
3139 }
3140 return true;
3141 }
3142
3143 /* Called via elf_link_hash_traverse to transfer dynamic linking
3144 information on function code symbol entries to their corresponding
3145 function descriptor symbol entries. */
3146 static boolean
3147 func_desc_adjust (h, inf)
3148 struct elf_link_hash_entry *h;
3149 PTR inf;
3150 {
3151 struct bfd_link_info *info;
3152 struct ppc_link_hash_table *htab;
3153
3154 if (h->root.type == bfd_link_hash_indirect)
3155 return true;
3156
3157 if (h->root.type == bfd_link_hash_warning)
3158 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3159
3160 info = (struct bfd_link_info *) inf;
3161 htab = ppc_hash_table (info);
3162
3163 /* If this is a function code symbol, transfer dynamic linking
3164 information to the function descriptor symbol. */
3165 if (!((struct ppc_link_hash_entry *) h)->is_func)
3166 return true;
3167
3168 if (h->root.type == bfd_link_hash_undefweak
3169 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR))
3170 htab->have_undefweak = true;
3171
3172 if (h->plt.refcount > 0
3173 && h->root.root.string[0] == '.'
3174 && h->root.root.string[1] != '\0')
3175 {
3176 struct elf_link_hash_entry *fdh = ((struct ppc_link_hash_entry *) h)->oh;
3177 boolean force_local;
3178
3179 /* Find the corresponding function descriptor symbol. Create it
3180 as undefined if necessary. */
3181
3182 if (fdh == NULL)
3183 fdh = elf_link_hash_lookup (&htab->elf, h->root.root.string + 1,
3184 false, false, true);
3185
3186 if (fdh == NULL
3187 && info->shared
3188 && (h->root.type == bfd_link_hash_undefined
3189 || h->root.type == bfd_link_hash_undefweak))
3190 {
3191 bfd *abfd;
3192 asymbol *newsym;
3193
3194 abfd = h->root.u.undef.abfd;
3195 newsym = bfd_make_empty_symbol (abfd);
3196 newsym->name = h->root.root.string + 1;
3197 newsym->section = bfd_und_section_ptr;
3198 newsym->value = 0;
3199 newsym->flags = BSF_OBJECT;
3200 if (h->root.type == bfd_link_hash_undefweak)
3201 newsym->flags |= BSF_WEAK;
3202
3203 if ( !(_bfd_generic_link_add_one_symbol
3204 (info, abfd, newsym->name, newsym->flags,
3205 newsym->section, newsym->value, NULL, false, false,
3206 (struct bfd_link_hash_entry **) &fdh)))
3207 {
3208 return false;
3209 }
3210 fdh->elf_link_hash_flags &= ~ELF_LINK_NON_ELF;
3211 }
3212
3213 if (fdh != NULL
3214 && (fdh->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0
3215 && (info->shared
3216 || (fdh->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3217 || (fdh->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
3218 {
3219 if (fdh->dynindx == -1)
3220 if (! bfd_elf64_link_record_dynamic_symbol (info, fdh))
3221 return false;
3222 fdh->elf_link_hash_flags |= (h->elf_link_hash_flags
3223 & (ELF_LINK_HASH_REF_REGULAR
3224 | ELF_LINK_HASH_REF_DYNAMIC
3225 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3226 | ELF_LINK_NON_GOT_REF));
3227 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
3228 {
3229 fdh->plt.refcount = h->plt.refcount;
3230 fdh->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
3231 }
3232 ((struct ppc_link_hash_entry *) fdh)->is_func_descriptor = 1;
3233 ((struct ppc_link_hash_entry *) fdh)->oh = h;
3234 fdh->root.root.string = h->root.root.string + 1;
3235 ((struct ppc_link_hash_entry *) h)->oh = fdh;
3236 }
3237
3238 /* Now that the info is on the function descriptor, clear the
3239 function code sym info. Any function code syms for which we
3240 don't have a definition in a regular file, we force local.
3241 This prevents a shared library from exporting syms that have
3242 been imported from another library. Function code syms that
3243 are really in the library we must leave global to prevent the
3244 linker dragging in a definition from a static library. */
3245 force_local = ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3246 && info->shared);
3247 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
3248 }
3249
3250 return true;
3251 }
3252
3253 #define MIN_SAVE_FPR 14
3254 #define MAX_SAVE_FPR 31
3255
3256 /* Called near the start of bfd_elf_size_dynamic_sections. We use
3257 this hook to a) provide some gcc support functions, and b) transfer
3258 dynamic linking information gathered so far on function code symbol
3259 entries, to their corresponding function descriptor symbol entries. */
3260 static boolean
3261 ppc64_elf_func_desc_adjust (obfd, info)
3262 bfd *obfd ATTRIBUTE_UNUSED;
3263 struct bfd_link_info *info;
3264 {
3265 struct ppc_link_hash_table *htab;
3266 unsigned int lowest_savef = MAX_SAVE_FPR + 2;
3267 unsigned int lowest_restf = MAX_SAVE_FPR + 2;
3268 unsigned int i;
3269 struct elf_link_hash_entry *h;
3270 bfd_byte *p;
3271 char sym[10];
3272
3273 htab = ppc_hash_table (info);
3274
3275 if (htab->sfpr == NULL)
3276 /* We don't have any relocs. */
3277 return true;
3278
3279 /* First provide any missing ._savef* and ._restf* functions. */
3280 memcpy (sym, "._savef14", 10);
3281 for (i = MIN_SAVE_FPR; i <= MAX_SAVE_FPR; i++)
3282 {
3283 sym[7] = i / 10 + '0';
3284 sym[8] = i % 10 + '0';
3285 h = elf_link_hash_lookup (&htab->elf, sym, false, false, true);
3286 if (h != NULL
3287 && h->root.type == bfd_link_hash_undefined)
3288 {
3289 if (lowest_savef > i)
3290 lowest_savef = i;
3291 h->root.type = bfd_link_hash_defined;
3292 h->root.u.def.section = htab->sfpr;
3293 h->root.u.def.value = (i - lowest_savef) * 4;
3294 h->type = STT_FUNC;
3295 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3296 _bfd_elf_link_hash_hide_symbol (info, h, info->shared);
3297 }
3298 }
3299
3300 memcpy (sym, "._restf14", 10);
3301 for (i = MIN_SAVE_FPR; i <= MAX_SAVE_FPR; i++)
3302 {
3303 sym[7] = i / 10 + '0';
3304 sym[8] = i % 10 + '0';
3305 h = elf_link_hash_lookup (&htab->elf, sym, false, false, true);
3306 if (h != NULL
3307 && h->root.type == bfd_link_hash_undefined)
3308 {
3309 if (lowest_restf > i)
3310 lowest_restf = i;
3311 h->root.type = bfd_link_hash_defined;
3312 h->root.u.def.section = htab->sfpr;
3313 h->root.u.def.value = ((MAX_SAVE_FPR + 2 - lowest_savef) * 4
3314 + (i - lowest_restf) * 4);
3315 h->type = STT_FUNC;
3316 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3317 _bfd_elf_link_hash_hide_symbol (info, h, info->shared);
3318 }
3319 }
3320
3321 elf_link_hash_traverse (&htab->elf, func_desc_adjust, (PTR) info);
3322
3323 htab->sfpr->_raw_size = ((MAX_SAVE_FPR + 2 - lowest_savef) * 4
3324 + (MAX_SAVE_FPR + 2 - lowest_restf) * 4);
3325
3326 if (htab->sfpr->_raw_size == 0)
3327 {
3328 if (!htab->have_undefweak)
3329 {
3330 _bfd_strip_section_from_output (info, htab->sfpr);
3331 return true;
3332 }
3333
3334 htab->sfpr->_raw_size = 4;
3335 }
3336
3337 p = (bfd_byte *) bfd_alloc (htab->elf.dynobj, htab->sfpr->_raw_size);
3338 if (p == NULL)
3339 return false;
3340 htab->sfpr->contents = p;
3341
3342 for (i = lowest_savef; i <= MAX_SAVE_FPR; i++)
3343 {
3344 unsigned int fpr = i << 21;
3345 unsigned int stackoff = (1 << 16) - (MAX_SAVE_FPR + 1 - i) * 8;
3346 bfd_put_32 (htab->elf.dynobj, STFD_FR0_0R1 + fpr + stackoff, p);
3347 p += 4;
3348 }
3349 if (lowest_savef <= MAX_SAVE_FPR)
3350 {
3351 bfd_put_32 (htab->elf.dynobj, BLR, p);
3352 p += 4;
3353 }
3354
3355 for (i = lowest_restf; i <= MAX_SAVE_FPR; i++)
3356 {
3357 unsigned int fpr = i << 21;
3358 unsigned int stackoff = (1 << 16) - (MAX_SAVE_FPR + 1 - i) * 8;
3359 bfd_put_32 (htab->elf.dynobj, LFD_FR0_0R1 + fpr + stackoff, p);
3360 p += 4;
3361 }
3362 if (lowest_restf <= MAX_SAVE_FPR
3363 || htab->sfpr->_raw_size == 4)
3364 {
3365 bfd_put_32 (htab->elf.dynobj, BLR, p);
3366 }
3367
3368 return true;
3369 }
3370
3371 /* Adjust a symbol defined by a dynamic object and referenced by a
3372 regular object. The current definition is in some section of the
3373 dynamic object, but we're not including those sections. We have to
3374 change the definition to something the rest of the link can
3375 understand. */
3376
3377 static boolean
3378 ppc64_elf_adjust_dynamic_symbol (info, h)
3379 struct bfd_link_info *info;
3380 struct elf_link_hash_entry *h;
3381 {
3382 struct ppc_link_hash_table *htab;
3383 struct ppc_link_hash_entry * eh;
3384 struct ppc_dyn_relocs *p;
3385 asection *s;
3386 unsigned int power_of_two;
3387
3388 htab = ppc_hash_table (info);
3389
3390 /* Deal with function syms. */
3391 if (h->type == STT_FUNC
3392 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
3393 {
3394 /* Clear procedure linkage table information for any symbol that
3395 won't need a .plt entry. */
3396 if (!((struct ppc_link_hash_entry *) h)->is_func_descriptor
3397 || h->plt.refcount <= 0
3398 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
3399 || (! info->shared
3400 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3401 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0))
3402 {
3403 h->plt.offset = (bfd_vma) -1;
3404 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
3405 }
3406 return true;
3407 }
3408 else
3409 h->plt.offset = (bfd_vma) -1;
3410
3411 /* If this is a weak symbol, and there is a real definition, the
3412 processor independent code will have arranged for us to see the
3413 real definition first, and we can just use the same value. */
3414 if (h->weakdef != NULL)
3415 {
3416 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
3417 || h->weakdef->root.type == bfd_link_hash_defweak);
3418 h->root.u.def.section = h->weakdef->root.u.def.section;
3419 h->root.u.def.value = h->weakdef->root.u.def.value;
3420 return true;
3421 }
3422
3423 /* This is a reference to a symbol defined by a dynamic object which
3424 is not a function. */
3425
3426 /* If we are creating a shared library, we must presume that the
3427 only references to the symbol are via the global offset table.
3428 For such cases we need not do anything here; the relocations will
3429 be handled correctly by relocate_section. */
3430 if (info->shared)
3431 return true;
3432
3433 /* If there are no references to this symbol that do not use the
3434 GOT, we don't need to generate a copy reloc. */
3435 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
3436 return true;
3437
3438 eh = (struct ppc_link_hash_entry *) h;
3439 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3440 {
3441 s = p->sec->output_section;
3442 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3443 break;
3444 }
3445
3446 /* If we didn't find any dynamic relocs in read-only sections, then
3447 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
3448 if (p == NULL)
3449 {
3450 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
3451 return true;
3452 }
3453
3454 /* We must allocate the symbol in our .dynbss section, which will
3455 become part of the .bss section of the executable. There will be
3456 an entry for this symbol in the .dynsym section. The dynamic
3457 object will contain position independent code, so all references
3458 from the dynamic object to this symbol will go through the global
3459 offset table. The dynamic linker will use the .dynsym entry to
3460 determine the address it must put in the global offset table, so
3461 both the dynamic object and the regular object will refer to the
3462 same memory location for the variable. */
3463
3464 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
3465 copy the initial value out of the dynamic object and into the
3466 runtime process image. We need to remember the offset into the
3467 .rela.bss section we are going to use. */
3468 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
3469 {
3470 htab->srelbss->_raw_size += sizeof (Elf64_External_Rela);
3471 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
3472 }
3473
3474 /* We need to figure out the alignment required for this symbol. I
3475 have no idea how ELF linkers handle this. */
3476 power_of_two = bfd_log2 (h->size);
3477 if (power_of_two > 4)
3478 power_of_two = 4;
3479
3480 /* Apply the required alignment. */
3481 s = htab->sdynbss;
3482 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
3483 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
3484 {
3485 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
3486 return false;
3487 }
3488
3489 /* Define the symbol as being at this point in the section. */
3490 h->root.u.def.section = s;
3491 h->root.u.def.value = s->_raw_size;
3492
3493 /* Increment the section size to make room for the symbol. */
3494 s->_raw_size += h->size;
3495
3496 return true;
3497 }
3498
3499 /* If given a function descriptor symbol, hide both the function code
3500 sym and the descriptor. */
3501 static void
3502 ppc64_elf_hide_symbol (info, h, force_local)
3503 struct bfd_link_info *info;
3504 struct elf_link_hash_entry *h;
3505 boolean force_local;
3506 {
3507 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
3508
3509 if (((struct ppc_link_hash_entry *) h)->is_func_descriptor)
3510 {
3511 const char *name;
3512 struct elf_link_hash_entry *fh = ((struct ppc_link_hash_entry *) h)->oh;
3513 struct ppc_link_hash_table *htab;
3514
3515 name = h->root.root.string - 1;
3516 htab = ppc_hash_table (info);
3517 if (fh == NULL)
3518 fh = elf_link_hash_lookup (&htab->elf, name, false, false, false);
3519 if (fh != NULL)
3520 _bfd_elf_link_hash_hide_symbol (info, fh, force_local);
3521 }
3522 }
3523
3524 /* This is the condition under which ppc64_elf_finish_dynamic_symbol
3525 will be called from elflink.h. If elflink.h doesn't call our
3526 finish_dynamic_symbol routine, we'll need to do something about
3527 initializing any .plt and .got entries in ppc64_elf_relocate_section. */
3528 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \
3529 ((DYN) \
3530 && ((INFO)->shared \
3531 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
3532 && ((H)->dynindx != -1 \
3533 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
3534
3535 /* Allocate space in .plt, .got and associated reloc sections for
3536 dynamic relocs. */
3537
3538 static boolean
3539 allocate_dynrelocs (h, inf)
3540 struct elf_link_hash_entry *h;
3541 PTR inf;
3542 {
3543 struct bfd_link_info *info;
3544 struct ppc_link_hash_table *htab;
3545 asection *s;
3546 struct ppc_link_hash_entry *eh;
3547 struct ppc_dyn_relocs *p;
3548
3549 if (h->root.type == bfd_link_hash_indirect)
3550 return true;
3551
3552 if (h->root.type == bfd_link_hash_warning)
3553 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3554
3555 info = (struct bfd_link_info *) inf;
3556 htab = ppc_hash_table (info);
3557
3558 if (htab->elf.dynamic_sections_created
3559 && h->plt.refcount > 0
3560 && h->dynindx != -1)
3561 {
3562 BFD_ASSERT (((struct ppc_link_hash_entry *) h)->is_func_descriptor);
3563
3564 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h))
3565 {
3566 /* If this is the first .plt entry, make room for the special
3567 first entry. */
3568 s = htab->splt;
3569 if (s->_raw_size == 0)
3570 s->_raw_size += PLT_INITIAL_ENTRY_SIZE;
3571
3572 h->plt.offset = s->_raw_size;
3573
3574 /* Make room for this entry. */
3575 s->_raw_size += PLT_ENTRY_SIZE;
3576
3577 /* Make room for the .glink code. */
3578 s = htab->sglink;
3579 if (s->_raw_size == 0)
3580 s->_raw_size += GLINK_CALL_STUB_SIZE;
3581 /* We need bigger stubs past index 32767. */
3582 if (s->_raw_size >= GLINK_CALL_STUB_SIZE + 32768*2*4)
3583 s->_raw_size += 4;
3584 s->_raw_size += 2*4;
3585
3586 /* We also need to make an entry in the .rela.plt section. */
3587 s = htab->srelplt;
3588 s->_raw_size += sizeof (Elf64_External_Rela);
3589 }
3590 else
3591 {
3592 h->plt.offset = (bfd_vma) -1;
3593 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
3594 }
3595 }
3596 else
3597 {
3598 h->plt.offset = (bfd_vma) -1;
3599 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
3600 }
3601
3602 if (h->got.refcount > 0)
3603 {
3604 boolean dyn;
3605
3606 /* Make sure this symbol is output as a dynamic symbol.
3607 Undefined weak syms won't yet be marked as dynamic. */
3608 if (h->dynindx == -1
3609 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
3610 {
3611 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
3612 return false;
3613 }
3614
3615 s = htab->sgot;
3616 h->got.offset = s->_raw_size;
3617 s->_raw_size += 8;
3618 dyn = htab->elf.dynamic_sections_created;
3619 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h))
3620 htab->srelgot->_raw_size += sizeof (Elf64_External_Rela);
3621 }
3622 else
3623 h->got.offset = (bfd_vma) -1;
3624
3625 eh = (struct ppc_link_hash_entry *) h;
3626 if (eh->dyn_relocs == NULL)
3627 return true;
3628
3629 /* In the shared -Bsymbolic case, discard space allocated for
3630 dynamic pc-relative relocs against symbols which turn out to be
3631 defined in regular objects. For the normal shared case, discard
3632 space for relocs that have become local due to symbol visibility
3633 changes. */
3634
3635 if (info->shared)
3636 {
3637 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3638 && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
3639 || info->symbolic))
3640 {
3641 struct ppc_dyn_relocs **pp;
3642
3643 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
3644 {
3645 p->count -= p->pc_count;
3646 p->pc_count = 0;
3647 if (p->count == 0)
3648 *pp = p->next;
3649 else
3650 pp = &p->next;
3651 }
3652 }
3653 }
3654 else
3655 {
3656 /* For the non-shared case, discard space for relocs against
3657 symbols which turn out to need copy relocs or are not
3658 dynamic. */
3659
3660 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
3661 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3662 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3663 || (htab->elf.dynamic_sections_created
3664 && (h->root.type == bfd_link_hash_undefweak
3665 || h->root.type == bfd_link_hash_undefined))))
3666 {
3667 /* Make sure this symbol is output as a dynamic symbol.
3668 Undefined weak syms won't yet be marked as dynamic. */
3669 if (h->dynindx == -1
3670 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
3671 {
3672 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
3673 return false;
3674 }
3675
3676 /* If that succeeded, we know we'll be keeping all the
3677 relocs. */
3678 if (h->dynindx != -1)
3679 goto keep;
3680 }
3681
3682 eh->dyn_relocs = NULL;
3683
3684 keep: ;
3685 }
3686
3687 /* Finally, allocate space. */
3688 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3689 {
3690 asection *sreloc = elf_section_data (p->sec)->sreloc;
3691 sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela);
3692 }
3693
3694 return true;
3695 }
3696
3697 /* Find any dynamic relocs that apply to read-only sections. */
3698
3699 static boolean
3700 readonly_dynrelocs (h, inf)
3701 struct elf_link_hash_entry *h;
3702 PTR inf;
3703 {
3704 struct ppc_link_hash_entry *eh;
3705 struct ppc_dyn_relocs *p;
3706
3707 if (h->root.type == bfd_link_hash_warning)
3708 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3709
3710 eh = (struct ppc_link_hash_entry *) h;
3711 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3712 {
3713 asection *s = p->sec->output_section;
3714
3715 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3716 {
3717 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3718
3719 info->flags |= DF_TEXTREL;
3720
3721 /* Not an error, just cut short the traversal. */
3722 return false;
3723 }
3724 }
3725 return true;
3726 }
3727
3728 /* Set the sizes of the dynamic sections. */
3729
3730 static boolean
3731 ppc64_elf_size_dynamic_sections (output_bfd, info)
3732 bfd *output_bfd ATTRIBUTE_UNUSED;
3733 struct bfd_link_info *info;
3734 {
3735 struct ppc_link_hash_table *htab;
3736 bfd *dynobj;
3737 asection *s;
3738 boolean relocs;
3739 bfd *ibfd;
3740
3741 htab = ppc_hash_table (info);
3742 dynobj = htab->elf.dynobj;
3743 if (dynobj == NULL)
3744 abort ();
3745
3746 if (htab->elf.dynamic_sections_created)
3747 {
3748 /* Set the contents of the .interp section to the interpreter. */
3749 if (! info->shared)
3750 {
3751 s = bfd_get_section_by_name (dynobj, ".interp");
3752 if (s == NULL)
3753 abort ();
3754 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
3755 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
3756 }
3757 }
3758
3759 /* Set up .got offsets for local syms, and space for local dynamic
3760 relocs. */
3761 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
3762 {
3763 bfd_signed_vma *local_got;
3764 bfd_signed_vma *end_local_got;
3765 bfd_size_type locsymcount;
3766 Elf_Internal_Shdr *symtab_hdr;
3767 asection *srel;
3768
3769 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
3770 continue;
3771
3772 for (s = ibfd->sections; s != NULL; s = s->next)
3773 {
3774 struct ppc_dyn_relocs *p;
3775
3776 for (p = *((struct ppc_dyn_relocs **)
3777 &elf_section_data (s)->local_dynrel);
3778 p != NULL;
3779 p = p->next)
3780 {
3781 if (!bfd_is_abs_section (p->sec)
3782 && bfd_is_abs_section (p->sec->output_section))
3783 {
3784 /* Input section has been discarded, either because
3785 it is a copy of a linkonce section or due to
3786 linker script /DISCARD/, so we'll be discarding
3787 the relocs too. */
3788 }
3789 else if (p->count != 0)
3790 {
3791 srel = elf_section_data (p->sec)->sreloc;
3792 srel->_raw_size += p->count * sizeof (Elf64_External_Rela);
3793 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
3794 info->flags |= DF_TEXTREL;
3795 }
3796 }
3797 }
3798
3799 local_got = elf_local_got_refcounts (ibfd);
3800 if (!local_got)
3801 continue;
3802
3803 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
3804 locsymcount = symtab_hdr->sh_info;
3805 end_local_got = local_got + locsymcount;
3806 s = htab->sgot;
3807 srel = htab->srelgot;
3808 for (; local_got < end_local_got; ++local_got)
3809 {
3810 if (*local_got > 0)
3811 {
3812 *local_got = s->_raw_size;
3813 s->_raw_size += 8;
3814 if (info->shared)
3815 srel->_raw_size += sizeof (Elf64_External_Rela);
3816 }
3817 else
3818 *local_got = (bfd_vma) -1;
3819 }
3820 }
3821
3822 /* Allocate global sym .plt and .got entries, and space for global
3823 sym dynamic relocs. */
3824 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
3825
3826 /* We now have determined the sizes of the various dynamic sections.
3827 Allocate memory for them. */
3828 relocs = false;
3829 for (s = dynobj->sections; s != NULL; s = s->next)
3830 {
3831 if ((s->flags & SEC_LINKER_CREATED) == 0)
3832 continue;
3833
3834 if (s == htab->sbrlt || s == htab->srelbrlt)
3835 /* These haven't been allocated yet; don't strip. */
3836 continue;
3837 else if (s == htab->splt
3838 || s == htab->sgot
3839 || s == htab->sglink)
3840 {
3841 /* Strip this section if we don't need it; see the
3842 comment below. */
3843 }
3844 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
3845 {
3846 if (s->_raw_size == 0)
3847 {
3848 /* If we don't need this section, strip it from the
3849 output file. This is mostly to handle .rela.bss and
3850 .rela.plt. We must create both sections in
3851 create_dynamic_sections, because they must be created
3852 before the linker maps input sections to output
3853 sections. The linker does that before
3854 adjust_dynamic_symbol is called, and it is that
3855 function which decides whether anything needs to go
3856 into these sections. */
3857 }
3858 else
3859 {
3860 if (s != htab->srelplt)
3861 relocs = true;
3862
3863 /* We use the reloc_count field as a counter if we need
3864 to copy relocs into the output file. */
3865 s->reloc_count = 0;
3866 }
3867 }
3868 else
3869 {
3870 /* It's not one of our sections, so don't allocate space. */
3871 continue;
3872 }
3873
3874 if (s->_raw_size == 0)
3875 {
3876 _bfd_strip_section_from_output (info, s);
3877 continue;
3878 }
3879
3880 /* Allocate memory for the section contents. We use bfd_zalloc
3881 here in case unused entries are not reclaimed before the
3882 section's contents are written out. This should not happen,
3883 but this way if it does, we get a R_PPC64_NONE reloc instead
3884 of garbage. */
3885 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
3886 if (s->contents == NULL)
3887 return false;
3888 }
3889
3890 if (htab->elf.dynamic_sections_created)
3891 {
3892 /* Add some entries to the .dynamic section. We fill in the
3893 values later, in ppc64_elf_finish_dynamic_sections, but we
3894 must add the entries now so that we get the correct size for
3895 the .dynamic section. The DT_DEBUG entry is filled in by the
3896 dynamic linker and used by the debugger. */
3897 #define add_dynamic_entry(TAG, VAL) \
3898 bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
3899
3900 if (!info->shared)
3901 {
3902 if (!add_dynamic_entry (DT_DEBUG, 0))
3903 return false;
3904 }
3905
3906 if (htab->splt->_raw_size != 0)
3907 {
3908 if (!add_dynamic_entry (DT_PLTGOT, 0)
3909 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3910 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3911 || !add_dynamic_entry (DT_JMPREL, 0)
3912 || !add_dynamic_entry (DT_PPC64_GLINK, 0))
3913 return false;
3914 }
3915
3916 if (NO_OPD_RELOCS)
3917 {
3918 if (!add_dynamic_entry (DT_PPC64_OPD, 0)
3919 || !add_dynamic_entry (DT_PPC64_OPDSZ, 0))
3920 return false;
3921 }
3922
3923 if (relocs)
3924 {
3925 if (!add_dynamic_entry (DT_RELA, 0)
3926 || !add_dynamic_entry (DT_RELASZ, 0)
3927 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
3928 return false;
3929
3930 /* If any dynamic relocs apply to a read-only section,
3931 then we need a DT_TEXTREL entry. */
3932 if ((info->flags & DF_TEXTREL) == 0)
3933 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
3934 (PTR) info);
3935
3936 if ((info->flags & DF_TEXTREL) != 0)
3937 {
3938 if (!add_dynamic_entry (DT_TEXTREL, 0))
3939 return false;
3940 }
3941 }
3942 }
3943 #undef add_dynamic_entry
3944
3945 return true;
3946 }
3947
3948 /* Determine the type of stub needed, if any, for a call. */
3949
3950 static INLINE enum ppc_stub_type
3951 ppc_type_of_stub (input_sec, rel, hash, destination)
3952 asection *input_sec;
3953 const Elf_Internal_Rela *rel;
3954 struct ppc_link_hash_entry **hash;
3955 bfd_vma destination;
3956 {
3957 struct ppc_link_hash_entry *h = *hash;
3958 bfd_vma location;
3959 bfd_vma branch_offset;
3960 bfd_vma max_branch_offset;
3961 unsigned int r_type;
3962
3963 if (h != NULL)
3964 {
3965 if (h->oh != NULL
3966 && h->oh->plt.offset != (bfd_vma) -1
3967 && h->oh->dynindx != -1)
3968 {
3969 *hash = (struct ppc_link_hash_entry *) h->oh;
3970 return ppc_stub_plt_call;
3971 }
3972
3973 if (h->elf.root.type == bfd_link_hash_undefweak
3974 || h->elf.root.type == bfd_link_hash_undefined)
3975 return ppc_stub_none;
3976 }
3977
3978 /* Determine where the call point is. */
3979 location = (input_sec->output_offset
3980 + input_sec->output_section->vma
3981 + rel->r_offset);
3982
3983 branch_offset = destination - location;
3984 r_type = ELF64_R_TYPE (rel->r_info);
3985
3986 /* Determine if a long branch stub is needed. */
3987 max_branch_offset = 1 << 25;
3988 if (r_type != (unsigned int) R_PPC64_REL24)
3989 max_branch_offset = 1 << 15;
3990
3991 if (branch_offset + max_branch_offset >= 2 * max_branch_offset)
3992 /* We need a stub. Figure out whether a long_branch or plt_branch
3993 is needed later. */
3994 return ppc_stub_long_branch;
3995
3996 return ppc_stub_none;
3997 }
3998
3999 /* Build a .plt call stub. */
4000
4001 static bfd_byte *
4002 build_plt_stub (obfd, p, offset, glink)
4003 bfd *obfd;
4004 bfd_byte *p;
4005 int offset;
4006 int glink;
4007 {
4008 #define PPC_LO(v) ((v) & 0xffff)
4009 #define PPC_HI(v) (((v) >> 16) & 0xffff)
4010 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
4011
4012 if (glink)
4013 bfd_put_32 (obfd, LD_R2_40R1, p), p += 4;
4014 bfd_put_32 (obfd, ADDIS_R12_R2 | PPC_HA (offset), p), p += 4;
4015 if (!glink)
4016 bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
4017 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4;
4018 if (PPC_HA (offset + 8) != PPC_HA (offset))
4019 bfd_put_32 (obfd, ADDIS_R12_R12_1, p), p += 4;
4020 offset += 8;
4021 bfd_put_32 (obfd, LD_R2_0R12 | PPC_LO (offset), p), p += 4;
4022 if (PPC_HA (offset + 8) != PPC_HA (offset))
4023 bfd_put_32 (obfd, ADDIS_R12_R12_1, p), p += 4;
4024 offset += 8;
4025 bfd_put_32 (obfd, MTCTR_R11, p), p += 4;
4026 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4;
4027 bfd_put_32 (obfd, BCTR, p), p += 4;
4028 return p;
4029 }
4030
4031 static boolean
4032 ppc_build_one_stub (gen_entry, in_arg)
4033 struct bfd_hash_entry *gen_entry;
4034 PTR in_arg;
4035 {
4036 struct ppc_stub_hash_entry *stub_entry;
4037 struct ppc_branch_hash_entry *br_entry;
4038 struct bfd_link_info *info;
4039 struct ppc_link_hash_table *htab;
4040 asection *stub_sec;
4041 bfd *stub_bfd;
4042 bfd_byte *loc;
4043 bfd_byte *p;
4044 unsigned int indx;
4045 bfd_vma off;
4046 int size;
4047
4048 /* Massage our args to the form they really have. */
4049 stub_entry = (struct ppc_stub_hash_entry *) gen_entry;
4050 info = (struct bfd_link_info *) in_arg;
4051
4052 htab = ppc_hash_table (info);
4053 stub_sec = stub_entry->stub_sec;
4054
4055 /* Make a note of the offset within the stubs for this entry. */
4056 stub_entry->stub_offset = stub_sec->_cooked_size;
4057 loc = stub_sec->contents + stub_entry->stub_offset;
4058
4059 stub_bfd = stub_sec->owner;
4060
4061 switch (stub_entry->stub_type)
4062 {
4063 case ppc_stub_long_branch:
4064 /* Branches are relative. This is where we are going to. */
4065 off = (stub_entry->target_value
4066 + stub_entry->target_section->output_offset
4067 + stub_entry->target_section->output_section->vma);
4068
4069 /* And this is where we are coming from. */
4070 off -= (stub_entry->stub_offset
4071 + stub_sec->output_offset
4072 + stub_sec->output_section->vma);
4073
4074 BFD_ASSERT (off + (1 << 25) < (bfd_vma) (1 << 26));
4075
4076 bfd_put_32 (stub_bfd, (bfd_vma) B_DOT | (off & 0x3fffffc), loc);
4077 size = 4;
4078 break;
4079
4080 case ppc_stub_plt_branch:
4081 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table,
4082 stub_entry->root.string + 9,
4083 false, false);
4084 if (br_entry == NULL)
4085 {
4086 (*_bfd_error_handler) (_("can't find branch stub `%s'"),
4087 stub_entry->root.string + 9);
4088 htab->stub_error = true;
4089 return false;
4090 }
4091
4092 off = (stub_entry->target_value
4093 + stub_entry->target_section->output_offset
4094 + stub_entry->target_section->output_section->vma);
4095
4096 bfd_put_64 (htab->sbrlt->owner, off,
4097 htab->sbrlt->contents + br_entry->offset);
4098
4099 if (info->shared)
4100 {
4101 /* Create a reloc for the branch lookup table entry. */
4102 Elf_Internal_Rela rela;
4103 Elf64_External_Rela *r;
4104
4105 rela.r_offset = (br_entry->offset
4106 + htab->sbrlt->output_offset
4107 + htab->sbrlt->output_section->vma);
4108 rela.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE);
4109 rela.r_addend = off;
4110
4111 r = (Elf64_External_Rela *) htab->srelbrlt->contents;
4112 r += htab->srelbrlt->reloc_count++;
4113 bfd_elf64_swap_reloca_out (htab->srelbrlt->owner, &rela, r);
4114 }
4115
4116 off = (br_entry->offset
4117 + htab->sbrlt->output_offset
4118 + htab->sbrlt->output_section->vma
4119 - elf_gp (htab->sbrlt->output_section->owner)
4120 - TOC_BASE_OFF);
4121
4122 if (off + 0x80000000 > 0xffffffff || (off & 7) != 0)
4123 {
4124 (*_bfd_error_handler)
4125 (_("linkage table error against `%s'"),
4126 stub_entry->root.string);
4127 bfd_set_error (bfd_error_bad_value);
4128 htab->stub_error = true;
4129 return false;
4130 }
4131
4132 indx = off;
4133 bfd_put_32 (stub_bfd, (bfd_vma) ADDIS_R12_R2 | PPC_HA (indx), loc);
4134 bfd_put_32 (stub_bfd, (bfd_vma) LD_R11_0R12 | PPC_LO (indx), loc + 4);
4135 bfd_put_32 (stub_bfd, (bfd_vma) MTCTR_R11, loc + 8);
4136 bfd_put_32 (stub_bfd, (bfd_vma) BCTR, loc + 12);
4137 size = 16;
4138 break;
4139
4140 case ppc_stub_plt_call:
4141 /* Build the .glink lazy link call stub. */
4142 p = htab->sglink->contents + htab->sglink->_cooked_size;
4143 indx = htab->sglink->reloc_count;
4144 if (indx < 0x8000)
4145 {
4146 bfd_put_32 (htab->sglink->owner, LI_R0_0 | indx, p);
4147 p += 4;
4148 }
4149 else
4150 {
4151 bfd_put_32 (htab->sglink->owner, LIS_R0_0 | PPC_HI (indx), p);
4152 p += 4;
4153 bfd_put_32 (htab->sglink->owner, ORI_R0_R0_0 | PPC_LO (indx), p);
4154 p += 4;
4155 }
4156 bfd_put_32 (htab->sglink->owner,
4157 B_DOT | ((htab->sglink->contents - p) & 0x3fffffc), p);
4158 p += 4;
4159 htab->sglink->_cooked_size = p - htab->sglink->contents;
4160 htab->sglink->reloc_count += 1;
4161
4162 /* Now build the stub. */
4163 off = stub_entry->h->elf.plt.offset;
4164 if (off >= (bfd_vma) -2)
4165 abort ();
4166
4167 off &= ~ (bfd_vma) 1;
4168 off += (htab->splt->output_offset
4169 + htab->splt->output_section->vma
4170 - elf_gp (htab->splt->output_section->owner)
4171 - TOC_BASE_OFF);
4172
4173 if (off + 0x80000000 > 0xffffffff || (off & 7) != 0)
4174 {
4175 (*_bfd_error_handler)
4176 (_("linkage table error against `%s'"),
4177 stub_entry->h->elf.root.root.string);
4178 bfd_set_error (bfd_error_bad_value);
4179 htab->stub_error = true;
4180 return false;
4181 }
4182
4183 p = build_plt_stub (stub_bfd, loc, (int) off, 0);
4184 size = p - loc;
4185 break;
4186
4187 default:
4188 BFD_FAIL ();
4189 return false;
4190 }
4191
4192 stub_sec->_cooked_size += size;
4193 return true;
4194 }
4195
4196 /* As above, but don't actually build the stub. Just bump offset so
4197 we know stub section sizes, and select plt_branch stubs where
4198 long_branch stubs won't do. */
4199
4200 static boolean
4201 ppc_size_one_stub (gen_entry, in_arg)
4202 struct bfd_hash_entry *gen_entry;
4203 PTR in_arg;
4204 {
4205 struct ppc_stub_hash_entry *stub_entry;
4206 struct ppc_link_hash_table *htab;
4207 bfd_vma off;
4208 int size;
4209
4210 /* Massage our args to the form they really have. */
4211 stub_entry = (struct ppc_stub_hash_entry *) gen_entry;
4212 htab = (struct ppc_link_hash_table *) in_arg;
4213
4214 if (stub_entry->stub_type == ppc_stub_plt_call)
4215 {
4216 off = stub_entry->h->elf.plt.offset & ~(bfd_vma) 1;
4217 off += (htab->splt->output_offset
4218 + htab->splt->output_section->vma
4219 - elf_gp (htab->splt->output_section->owner)
4220 - TOC_BASE_OFF);
4221
4222 size = 28;
4223 if (PPC_HA ((int) off + 16) != PPC_HA ((int) off))
4224 size += 4;
4225 }
4226 else
4227 {
4228 /* ppc_stub_long_branch or ppc_stub_plt_branch. */
4229 stub_entry->stub_type = ppc_stub_long_branch;
4230 size = 4;
4231
4232 off = (stub_entry->target_value
4233 + stub_entry->target_section->output_offset
4234 + stub_entry->target_section->output_section->vma);
4235 off -= (stub_entry->stub_sec->_raw_size
4236 + stub_entry->stub_sec->output_offset
4237 + stub_entry->stub_sec->output_section->vma);
4238
4239 if (off + (1 << 25) >= (bfd_vma) (1 << 26))
4240 {
4241 struct ppc_branch_hash_entry *br_entry;
4242
4243 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table,
4244 stub_entry->root.string + 9,
4245 true, false);
4246 if (br_entry == NULL)
4247 {
4248 (*_bfd_error_handler) (_("can't build branch stub `%s'"),
4249 stub_entry->root.string + 9);
4250 htab->stub_error = true;
4251 return false;
4252 }
4253
4254 if (br_entry->iter != htab->stub_iteration)
4255 {
4256 br_entry->iter = htab->stub_iteration;
4257 br_entry->offset = htab->sbrlt->_raw_size;
4258 htab->sbrlt->_raw_size += 8;
4259 }
4260 stub_entry->stub_type = ppc_stub_plt_branch;
4261 size = 16;
4262 }
4263 }
4264
4265 stub_entry->stub_sec->_raw_size += size;
4266 return true;
4267 }
4268
4269 /* Set up various things so that we can make a list of input sections
4270 for each output section included in the link. Returns -1 on error,
4271 0 when no stubs will be needed, and 1 on success. */
4272
4273 int
4274 ppc64_elf_setup_section_lists (output_bfd, info)
4275 bfd *output_bfd;
4276 struct bfd_link_info *info;
4277 {
4278 bfd *input_bfd;
4279 unsigned int bfd_count;
4280 int top_id, top_index;
4281 asection *section;
4282 asection **input_list, **list;
4283 bfd_size_type amt;
4284 struct ppc_link_hash_table *htab = ppc_hash_table (info);
4285
4286 if (htab->elf.root.creator->flavour != bfd_target_elf_flavour
4287 || htab->sbrlt == NULL)
4288 return 0;
4289
4290 /* Count the number of input BFDs and find the top input section id. */
4291 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
4292 input_bfd != NULL;
4293 input_bfd = input_bfd->link_next)
4294 {
4295 bfd_count += 1;
4296 for (section = input_bfd->sections;
4297 section != NULL;
4298 section = section->next)
4299 {
4300 if (top_id < section->id)
4301 top_id = section->id;
4302 }
4303 }
4304 htab->bfd_count = bfd_count;
4305
4306 amt = sizeof (struct map_stub) * (top_id + 1);
4307 htab->stub_group = (struct map_stub *) bfd_zmalloc (amt);
4308 if (htab->stub_group == NULL)
4309 return -1;
4310
4311 /* We can't use output_bfd->section_count here to find the top output
4312 section index as some sections may have been removed, and
4313 _bfd_strip_section_from_output doesn't renumber the indices. */
4314 for (section = output_bfd->sections, top_index = 0;
4315 section != NULL;
4316 section = section->next)
4317 {
4318 if (top_index < section->index)
4319 top_index = section->index;
4320 }
4321
4322 htab->top_index = top_index;
4323 amt = sizeof (asection *) * (top_index + 1);
4324 input_list = (asection **) bfd_malloc (amt);
4325 htab->input_list = input_list;
4326 if (input_list == NULL)
4327 return -1;
4328
4329 /* For sections we aren't interested in, mark their entries with a
4330 value we can check later. */
4331 list = input_list + top_index;
4332 do
4333 *list = bfd_abs_section_ptr;
4334 while (list-- != input_list);
4335
4336 for (section = output_bfd->sections;
4337 section != NULL;
4338 section = section->next)
4339 {
4340 if ((section->flags & SEC_CODE) != 0)
4341 input_list[section->index] = NULL;
4342 }
4343
4344 return 1;
4345 }
4346
4347 /* The linker repeatedly calls this function for each input section,
4348 in the order that input sections are linked into output sections.
4349 Build lists of input sections to determine groupings between which
4350 we may insert linker stubs. */
4351
4352 void
4353 ppc64_elf_next_input_section (info, isec)
4354 struct bfd_link_info *info;
4355 asection *isec;
4356 {
4357 struct ppc_link_hash_table *htab = ppc_hash_table (info);
4358
4359 if (isec->output_section->index <= htab->top_index)
4360 {
4361 asection **list = htab->input_list + isec->output_section->index;
4362 if (*list != bfd_abs_section_ptr)
4363 {
4364 /* Steal the link_sec pointer for our list. */
4365 #define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec)
4366 /* This happens to make the list in reverse order,
4367 which is what we want. */
4368 PREV_SEC (isec) = *list;
4369 *list = isec;
4370 }
4371 }
4372 }
4373
4374 /* See whether we can group stub sections together. Grouping stub
4375 sections may result in fewer stubs. More importantly, we need to
4376 put all .init* and .fini* stubs at the beginning of the .init or
4377 .fini output sections respectively, because glibc splits the
4378 _init and _fini functions into multiple parts. Putting a stub in
4379 the middle of a function is not a good idea. */
4380
4381 static void
4382 group_sections (htab, stub_group_size, stubs_always_before_branch)
4383 struct ppc_link_hash_table *htab;
4384 bfd_size_type stub_group_size;
4385 boolean stubs_always_before_branch;
4386 {
4387 asection **list = htab->input_list + htab->top_index;
4388 do
4389 {
4390 asection *tail = *list;
4391 if (tail == bfd_abs_section_ptr)
4392 continue;
4393 while (tail != NULL)
4394 {
4395 asection *curr;
4396 asection *prev;
4397 bfd_size_type total;
4398
4399 curr = tail;
4400 if (tail->_cooked_size)
4401 total = tail->_cooked_size;
4402 else
4403 total = tail->_raw_size;
4404 while ((prev = PREV_SEC (curr)) != NULL
4405 && ((total += curr->output_offset - prev->output_offset)
4406 < stub_group_size))
4407 curr = prev;
4408
4409 /* OK, the size from the start of CURR to the end is less
4410 than stub_group_size and thus can be handled by one stub
4411 section. (or the tail section is itself larger than
4412 stub_group_size, in which case we may be toast.) We
4413 should really be keeping track of the total size of stubs
4414 added here, as stubs contribute to the final output
4415 section size. That's a little tricky, and this way will
4416 only break if stubs added make the total size more than
4417 2^25, ie. for the default stub_group_size, if stubs total
4418 more than 2834432 bytes, or over 100000 plt call stubs. */
4419 do
4420 {
4421 prev = PREV_SEC (tail);
4422 /* Set up this stub group. */
4423 htab->stub_group[tail->id].link_sec = curr;
4424 }
4425 while (tail != curr && (tail = prev) != NULL);
4426
4427 /* But wait, there's more! Input sections up to stub_group_size
4428 bytes before the stub section can be handled by it too. */
4429 if (!stubs_always_before_branch)
4430 {
4431 total = 0;
4432 while (prev != NULL
4433 && ((total += tail->output_offset - prev->output_offset)
4434 < stub_group_size))
4435 {
4436 tail = prev;
4437 prev = PREV_SEC (tail);
4438 htab->stub_group[tail->id].link_sec = curr;
4439 }
4440 }
4441 tail = prev;
4442 }
4443 }
4444 while (list-- != htab->input_list);
4445 free (htab->input_list);
4446 #undef PREV_SEC
4447 }
4448
4449 /* Read in all local syms for all input bfds. */
4450
4451 static boolean
4452 get_local_syms (input_bfd, htab)
4453 bfd *input_bfd;
4454 struct ppc_link_hash_table *htab;
4455 {
4456 unsigned int bfd_indx;
4457 Elf_Internal_Sym *local_syms, **all_local_syms;
4458
4459 /* We want to read in symbol extension records only once. To do this
4460 we need to read in the local symbols in parallel and save them for
4461 later use; so hold pointers to the local symbols in an array. */
4462 bfd_size_type amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
4463 all_local_syms = (Elf_Internal_Sym **) bfd_zmalloc (amt);
4464 htab->all_local_syms = all_local_syms;
4465 if (all_local_syms == NULL)
4466 return false;
4467
4468 /* Walk over all the input BFDs, swapping in local symbols.
4469 If we are creating a shared library, create hash entries for the
4470 export stubs. */
4471 for (bfd_indx = 0;
4472 input_bfd != NULL;
4473 input_bfd = input_bfd->link_next, bfd_indx++)
4474 {
4475 Elf_Internal_Shdr *symtab_hdr;
4476 Elf_Internal_Shdr *shndx_hdr;
4477 Elf_Internal_Sym *isym;
4478 Elf64_External_Sym *ext_syms, *esym, *end_sy;
4479 Elf_External_Sym_Shndx *shndx_buf, *shndx;
4480 bfd_size_type sec_size;
4481
4482 /* We'll need the symbol table in a second. */
4483 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
4484 if (symtab_hdr->sh_info == 0)
4485 continue;
4486
4487 /* We need an array of the local symbols attached to the input bfd.
4488 Unfortunately, we're going to have to read & swap them in. */
4489 sec_size = symtab_hdr->sh_info;
4490 sec_size *= sizeof (Elf_Internal_Sym);
4491 local_syms = (Elf_Internal_Sym *) bfd_malloc (sec_size);
4492 if (local_syms == NULL)
4493 return false;
4494
4495 all_local_syms[bfd_indx] = local_syms;
4496 sec_size = symtab_hdr->sh_info;
4497 sec_size *= sizeof (Elf64_External_Sym);
4498 ext_syms = (Elf64_External_Sym *) bfd_malloc (sec_size);
4499 if (ext_syms == NULL)
4500 return false;
4501
4502 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
4503 || bfd_bread ((PTR) ext_syms, sec_size, input_bfd) != sec_size)
4504 {
4505 error_ret_free_ext_syms:
4506 free (ext_syms);
4507 return false;
4508 }
4509
4510 shndx_buf = NULL;
4511 shndx_hdr = &elf_tdata (input_bfd)->symtab_shndx_hdr;
4512 if (shndx_hdr->sh_size != 0)
4513 {
4514 sec_size = symtab_hdr->sh_info;
4515 sec_size *= sizeof (Elf_External_Sym_Shndx);
4516 shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (sec_size);
4517 if (shndx_buf == NULL)
4518 goto error_ret_free_ext_syms;
4519
4520 if (bfd_seek (input_bfd, shndx_hdr->sh_offset, SEEK_SET) != 0
4521 || bfd_bread ((PTR) shndx_buf, sec_size, input_bfd) != sec_size)
4522 {
4523 free (shndx_buf);
4524 goto error_ret_free_ext_syms;
4525 }
4526 }
4527
4528 /* Swap the local symbols in. */
4529 for (esym = ext_syms, end_sy = esym + symtab_hdr->sh_info,
4530 isym = local_syms, shndx = shndx_buf;
4531 esym < end_sy;
4532 esym++, isym++, shndx = (shndx ? shndx + 1 : NULL))
4533 bfd_elf64_swap_symbol_in (input_bfd, esym, shndx, isym);
4534
4535 /* Now we can free the external symbols. */
4536 free (shndx_buf);
4537 free (ext_syms);
4538 }
4539
4540 return true;
4541 }
4542
4543 /* Determine and set the size of the stub section for a final link.
4544
4545 The basic idea here is to examine all the relocations looking for
4546 PC-relative calls to a target that is unreachable with a "bl"
4547 instruction. */
4548
4549 boolean
4550 ppc64_elf_size_stubs (output_bfd, stub_bfd, info, group_size,
4551 add_stub_section, layout_sections_again)
4552 bfd *output_bfd;
4553 bfd *stub_bfd;
4554 struct bfd_link_info *info;
4555 bfd_signed_vma group_size;
4556 asection * (*add_stub_section) PARAMS ((const char *, asection *));
4557 void (*layout_sections_again) PARAMS ((void));
4558 {
4559 bfd_size_type stub_group_size;
4560 boolean stubs_always_before_branch;
4561 boolean ret = false;
4562 struct ppc_link_hash_table *htab = ppc_hash_table (info);
4563
4564 /* Stash our params away. */
4565 htab->stub_bfd = stub_bfd;
4566 htab->add_stub_section = add_stub_section;
4567 htab->layout_sections_again = layout_sections_again;
4568 stubs_always_before_branch = group_size < 0;
4569 if (group_size < 0)
4570 stub_group_size = -group_size;
4571 else
4572 stub_group_size = group_size;
4573 if (stub_group_size == 1)
4574 {
4575 /* Default values. */
4576 stub_group_size = 30720000;
4577 if (htab->has_14bit_branch)
4578 stub_group_size = 30000;
4579 }
4580
4581 group_sections (htab, stub_group_size, stubs_always_before_branch);
4582
4583 if (! get_local_syms (info->input_bfds, htab))
4584 {
4585 if (htab->all_local_syms)
4586 goto error_ret_free_local;
4587 return false;
4588 }
4589
4590 while (1)
4591 {
4592 bfd *input_bfd;
4593 unsigned int bfd_indx;
4594 asection *stub_sec;
4595 boolean stub_changed;
4596
4597 htab->stub_iteration += 1;
4598 stub_changed = false;
4599
4600 for (input_bfd = info->input_bfds, bfd_indx = 0;
4601 input_bfd != NULL;
4602 input_bfd = input_bfd->link_next, bfd_indx++)
4603 {
4604 Elf_Internal_Shdr *symtab_hdr;
4605 asection *section;
4606 Elf_Internal_Sym *local_syms;
4607
4608 /* We'll need the symbol table in a second. */
4609 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
4610 if (symtab_hdr->sh_info == 0)
4611 continue;
4612
4613 local_syms = htab->all_local_syms[bfd_indx];
4614
4615 /* Walk over each section attached to the input bfd. */
4616 for (section = input_bfd->sections;
4617 section != NULL;
4618 section = section->next)
4619 {
4620 Elf_Internal_Shdr *input_rel_hdr;
4621 Elf64_External_Rela *external_relocs, *erelaend, *erela;
4622 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
4623 bfd_size_type amt;
4624
4625 /* If there aren't any relocs, then there's nothing more
4626 to do. */
4627 if ((section->flags & SEC_RELOC) == 0
4628 || section->reloc_count == 0)
4629 continue;
4630
4631 /* If this section is a link-once section that will be
4632 discarded, then don't create any stubs. */
4633 if (section->output_section == NULL
4634 || section->output_section->owner != output_bfd)
4635 continue;
4636
4637 /* Allocate space for the external relocations. */
4638 amt = section->reloc_count;
4639 amt *= sizeof (Elf64_External_Rela);
4640 external_relocs = (Elf64_External_Rela *) bfd_malloc (amt);
4641 if (external_relocs == NULL)
4642 {
4643 goto error_ret_free_local;
4644 }
4645
4646 /* Likewise for the internal relocations. */
4647 amt = section->reloc_count;
4648 amt *= sizeof (Elf_Internal_Rela);
4649 internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
4650 if (internal_relocs == NULL)
4651 {
4652 free (external_relocs);
4653 goto error_ret_free_local;
4654 }
4655
4656 /* Read in the external relocs. */
4657 input_rel_hdr = &elf_section_data (section)->rel_hdr;
4658 if (bfd_seek (input_bfd, input_rel_hdr->sh_offset, SEEK_SET) != 0
4659 || bfd_bread ((PTR) external_relocs,
4660 input_rel_hdr->sh_size,
4661 input_bfd) != input_rel_hdr->sh_size)
4662 {
4663 free (external_relocs);
4664 error_ret_free_internal:
4665 free (internal_relocs);
4666 goto error_ret_free_local;
4667 }
4668
4669 /* Swap in the relocs. */
4670 erela = external_relocs;
4671 erelaend = erela + section->reloc_count;
4672 irela = internal_relocs;
4673 for (; erela < erelaend; erela++, irela++)
4674 bfd_elf64_swap_reloca_in (input_bfd, erela, irela);
4675
4676 /* We're done with the external relocs, free them. */
4677 free (external_relocs);
4678
4679 /* Now examine each relocation. */
4680 irela = internal_relocs;
4681 irelaend = irela + section->reloc_count;
4682 for (; irela < irelaend; irela++)
4683 {
4684 unsigned int r_type, r_indx;
4685 enum ppc_stub_type stub_type;
4686 struct ppc_stub_hash_entry *stub_entry;
4687 asection *sym_sec;
4688 bfd_vma sym_value;
4689 bfd_vma destination;
4690 struct ppc_link_hash_entry *hash;
4691 char *stub_name;
4692 const asection *id_sec;
4693
4694 r_type = ELF64_R_TYPE (irela->r_info);
4695 r_indx = ELF64_R_SYM (irela->r_info);
4696
4697 if (r_type >= (unsigned int) R_PPC_max)
4698 {
4699 bfd_set_error (bfd_error_bad_value);
4700 goto error_ret_free_internal;
4701 }
4702
4703 /* Only look for stubs on branch instructions. */
4704 if (r_type != (unsigned int) R_PPC64_REL24
4705 && r_type != (unsigned int) R_PPC64_REL14
4706 && r_type != (unsigned int) R_PPC64_REL14_BRTAKEN
4707 && r_type != (unsigned int) R_PPC64_REL14_BRNTAKEN)
4708 continue;
4709
4710 /* Now determine the call target, its name, value,
4711 section. */
4712 sym_sec = NULL;
4713 sym_value = 0;
4714 destination = 0;
4715 hash = NULL;
4716 if (r_indx < symtab_hdr->sh_info)
4717 {
4718 /* It's a local symbol. */
4719 Elf_Internal_Sym *sym;
4720 Elf_Internal_Shdr *hdr;
4721
4722 sym = local_syms + r_indx;
4723 hdr = elf_elfsections (input_bfd)[sym->st_shndx];
4724 sym_sec = hdr->bfd_section;
4725 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
4726 sym_value = sym->st_value;
4727 destination = (sym_value + irela->r_addend
4728 + sym_sec->output_offset
4729 + sym_sec->output_section->vma);
4730 }
4731 else
4732 {
4733 /* It's an external symbol. */
4734 int e_indx;
4735
4736 e_indx = r_indx - symtab_hdr->sh_info;
4737 hash = ((struct ppc_link_hash_entry *)
4738 elf_sym_hashes (input_bfd)[e_indx]);
4739
4740 while (hash->elf.root.type == bfd_link_hash_indirect
4741 || hash->elf.root.type == bfd_link_hash_warning)
4742 hash = ((struct ppc_link_hash_entry *)
4743 hash->elf.root.u.i.link);
4744
4745 if (hash->elf.root.type == bfd_link_hash_defined
4746 || hash->elf.root.type == bfd_link_hash_defweak)
4747 {
4748 sym_sec = hash->elf.root.u.def.section;
4749 sym_value = hash->elf.root.u.def.value;
4750 if (sym_sec->output_section != NULL)
4751 destination = (sym_value + irela->r_addend
4752 + sym_sec->output_offset
4753 + sym_sec->output_section->vma);
4754 }
4755 else if (hash->elf.root.type == bfd_link_hash_undefweak)
4756 ;
4757 else if (hash->elf.root.type == bfd_link_hash_undefined)
4758 ;
4759 else
4760 {
4761 bfd_set_error (bfd_error_bad_value);
4762 goto error_ret_free_internal;
4763 }
4764 }
4765
4766 /* Determine what (if any) linker stub is needed. */
4767 stub_type = ppc_type_of_stub (section, irela, &hash,
4768 destination);
4769 if (stub_type == ppc_stub_none)
4770 continue;
4771
4772 /* Support for grouping stub sections. */
4773 id_sec = htab->stub_group[section->id].link_sec;
4774
4775 /* Get the name of this stub. */
4776 stub_name = ppc_stub_name (id_sec, sym_sec, hash, irela);
4777 if (!stub_name)
4778 goto error_ret_free_internal;
4779
4780 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table,
4781 stub_name, false, false);
4782 if (stub_entry != NULL)
4783 {
4784 /* The proper stub has already been created. */
4785 free (stub_name);
4786 continue;
4787 }
4788
4789 stub_entry = ppc_add_stub (stub_name, section, htab);
4790 if (stub_entry == NULL)
4791 {
4792 free (stub_name);
4793 goto error_ret_free_local;
4794 }
4795
4796 stub_entry->target_value = sym_value;
4797 stub_entry->target_section = sym_sec;
4798 stub_entry->stub_type = stub_type;
4799 stub_entry->h = hash;
4800 stub_changed = true;
4801 }
4802
4803 /* We're done with the internal relocs, free them. */
4804 free (internal_relocs);
4805 }
4806 }
4807
4808 if (!stub_changed)
4809 break;
4810
4811 /* OK, we've added some stubs. Find out the new size of the
4812 stub sections. */
4813 for (stub_sec = htab->stub_bfd->sections;
4814 stub_sec != NULL;
4815 stub_sec = stub_sec->next)
4816 {
4817 stub_sec->_raw_size = 0;
4818 stub_sec->_cooked_size = 0;
4819 }
4820 htab->sbrlt->_raw_size = 0;
4821 htab->sbrlt->_cooked_size = 0;
4822
4823 bfd_hash_traverse (&htab->stub_hash_table, ppc_size_one_stub, htab);
4824
4825 /* Ask the linker to do its stuff. */
4826 (*htab->layout_sections_again) ();
4827 }
4828
4829 if (htab->sbrlt->_raw_size == 0)
4830 {
4831 _bfd_strip_section_from_output (info, htab->sbrlt);
4832 if (htab->srelbrlt != NULL)
4833 _bfd_strip_section_from_output (info, htab->srelbrlt);
4834 }
4835
4836 ret = true;
4837
4838 error_ret_free_local:
4839 while (htab->bfd_count-- > 0)
4840 if (htab->all_local_syms[htab->bfd_count])
4841 free (htab->all_local_syms[htab->bfd_count]);
4842 free (htab->all_local_syms);
4843
4844 return ret;
4845 }
4846
4847 /* Called after we have determined section placement. If sections
4848 move, we'll be called again. Provide a value for TOCstart. */
4849
4850 bfd_vma
4851 ppc64_elf_toc (obfd)
4852 bfd *obfd;
4853 {
4854 asection *s;
4855 bfd_vma TOCstart;
4856
4857 /* The TOC consists of sections .got, .toc, .tocbss, .plt in that
4858 order. The TOC starts where the first of these sections starts. */
4859 s = bfd_get_section_by_name (obfd, ".got");
4860 if (s == NULL)
4861 s = bfd_get_section_by_name (obfd, ".toc");
4862 if (s == NULL)
4863 s = bfd_get_section_by_name (obfd, ".tocbss");
4864 if (s == NULL)
4865 s = bfd_get_section_by_name (obfd, ".plt");
4866 if (s == NULL)
4867 {
4868 /* This may happen for
4869 o references to TOC base (SYM@toc / TOC[tc0]) without a
4870 .toc directive
4871 o bad linker script
4872 o --gc-sections and empty TOC sections
4873
4874 FIXME: Warn user? */
4875
4876 /* Look for a likely section. We probably won't even be
4877 using TOCstart. */
4878 for (s = obfd->sections; s != NULL; s = s->next)
4879 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA | SEC_READONLY))
4880 == (SEC_ALLOC | SEC_SMALL_DATA))
4881 break;
4882 if (s == NULL)
4883 for (s = obfd->sections; s != NULL; s = s->next)
4884 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA))
4885 == (SEC_ALLOC | SEC_SMALL_DATA))
4886 break;
4887 if (s == NULL)
4888 for (s = obfd->sections; s != NULL; s = s->next)
4889 if ((s->flags & (SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
4890 break;
4891 if (s == NULL)
4892 for (s = obfd->sections; s != NULL; s = s->next)
4893 if ((s->flags & SEC_ALLOC) == SEC_ALLOC)
4894 break;
4895 }
4896
4897 TOCstart = 0;
4898 if (s != NULL)
4899 TOCstart = s->output_section->vma + s->output_offset;
4900
4901 return TOCstart;
4902 }
4903
4904 /* Build all the stubs associated with the current output file.
4905 The stubs are kept in a hash table attached to the main linker
4906 hash table. This function is called via gldelf64ppc_finish. */
4907
4908 boolean
4909 ppc64_elf_build_stubs (info)
4910 struct bfd_link_info *info;
4911 {
4912 struct ppc_link_hash_table *htab = ppc_hash_table (info);
4913 asection *stub_sec;
4914 bfd_vma plt_r2;
4915 bfd_byte *p;
4916
4917 for (stub_sec = htab->stub_bfd->sections;
4918 stub_sec != NULL;
4919 stub_sec = stub_sec->next)
4920 {
4921 bfd_size_type size;
4922
4923 /* Allocate memory to hold the linker stubs. */
4924 size = stub_sec->_raw_size;
4925 if (size != 0)
4926 {
4927 stub_sec->contents = (bfd_byte *) bfd_zalloc (htab->stub_bfd, size);
4928 if (stub_sec->contents == NULL)
4929 return false;
4930 }
4931 stub_sec->_cooked_size = 0;
4932 }
4933
4934 if (htab->splt != NULL)
4935 {
4936 /* Build the .glink plt call stub. */
4937 plt_r2 = (htab->splt->output_offset
4938 + htab->splt->output_section->vma
4939 - elf_gp (htab->splt->output_section->owner)
4940 - TOC_BASE_OFF);
4941 p = htab->sglink->contents;
4942 p = build_plt_stub (htab->sglink->owner, p, (int) plt_r2, 1);
4943 while (p - htab->sglink->contents < GLINK_CALL_STUB_SIZE)
4944 {
4945 bfd_put_32 (htab->sglink->owner, NOP, p);
4946 p += 4;
4947 }
4948 htab->sglink->_cooked_size = p - htab->sglink->contents;
4949
4950 /* Use reloc_count to count entries. */
4951 htab->sglink->reloc_count = 0;
4952 }
4953
4954 if (htab->sbrlt->_raw_size != 0)
4955 {
4956 htab->sbrlt->contents = (bfd_byte *) bfd_zalloc (htab->sbrlt->owner,
4957 htab->sbrlt->_raw_size);
4958 if (htab->sbrlt->contents == NULL)
4959 return false;
4960 }
4961
4962 /* Build the stubs as directed by the stub hash table. */
4963 bfd_hash_traverse (&htab->stub_hash_table, ppc_build_one_stub, info);
4964 htab->sglink->reloc_count = 0;
4965
4966 for (stub_sec = htab->stub_bfd->sections;
4967 stub_sec != NULL;
4968 stub_sec = stub_sec->next)
4969 {
4970 if (stub_sec->_raw_size != stub_sec->_cooked_size)
4971 break;
4972 }
4973
4974 if (stub_sec != NULL
4975 || htab->sglink->_raw_size != htab->sglink->_cooked_size)
4976 {
4977 htab->stub_error = true;
4978 (*_bfd_error_handler) (_("stubs don't match calculated size"));
4979 }
4980
4981 return !htab->stub_error;
4982 }
4983
4984 /* Set up any other section flags and such that may be necessary. */
4985
4986 static boolean
4987 ppc64_elf_fake_sections (abfd, shdr, asect)
4988 bfd *abfd ATTRIBUTE_UNUSED;
4989 Elf64_Internal_Shdr *shdr;
4990 asection *asect;
4991 {
4992 if ((asect->flags & SEC_EXCLUDE) != 0)
4993 shdr->sh_flags |= SHF_EXCLUDE;
4994
4995 if ((asect->flags & SEC_SORT_ENTRIES) != 0)
4996 shdr->sh_type = SHT_ORDERED;
4997
4998 return true;
4999 }
5000
5001 /* The RELOCATE_SECTION function is called by the ELF backend linker
5002 to handle the relocations for a section.
5003
5004 The relocs are always passed as Rela structures; if the section
5005 actually uses Rel structures, the r_addend field will always be
5006 zero.
5007
5008 This function is responsible for adjust the section contents as
5009 necessary, and (if using Rela relocs and generating a
5010 relocateable output file) adjusting the reloc addend as
5011 necessary.
5012
5013 This function does not have to worry about setting the reloc
5014 address or the reloc symbol index.
5015
5016 LOCAL_SYMS is a pointer to the swapped in local symbols.
5017
5018 LOCAL_SECTIONS is an array giving the section in the input file
5019 corresponding to the st_shndx field of each local symbol.
5020
5021 The global hash table entry for the global symbols can be found
5022 via elf_sym_hashes (input_bfd).
5023
5024 When generating relocateable output, this function must handle
5025 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
5026 going to be the section symbol corresponding to the output
5027 section, which means that the addend must be adjusted
5028 accordingly. */
5029
5030 static boolean
5031 ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section,
5032 contents, relocs, local_syms, local_sections)
5033 bfd *output_bfd;
5034 struct bfd_link_info *info;
5035 bfd *input_bfd;
5036 asection *input_section;
5037 bfd_byte *contents;
5038 Elf_Internal_Rela *relocs;
5039 Elf_Internal_Sym *local_syms;
5040 asection **local_sections;
5041 {
5042 struct ppc_link_hash_table *htab;
5043 Elf_Internal_Shdr *symtab_hdr;
5044 struct elf_link_hash_entry **sym_hashes;
5045 Elf_Internal_Rela *rel;
5046 Elf_Internal_Rela *relend;
5047 bfd_vma *local_got_offsets;
5048 bfd_vma TOCstart;
5049 boolean ret = true;
5050 boolean is_opd;
5051 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */
5052 boolean is_power4 = false;
5053
5054 if (info->relocateable)
5055 return true;
5056
5057 /* Initialize howto table if needed. */
5058 if (!ppc64_elf_howto_table[R_PPC64_ADDR32])
5059 ppc_howto_init ();
5060
5061 htab = ppc_hash_table (info);
5062 local_got_offsets = elf_local_got_offsets (input_bfd);
5063 TOCstart = elf_gp (output_bfd);
5064 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5065 sym_hashes = elf_sym_hashes (input_bfd);
5066 is_opd = strcmp (bfd_get_section_name (abfd, input_section), ".opd") == 0;
5067
5068 rel = relocs;
5069 relend = relocs + input_section->reloc_count;
5070 for (; rel < relend; rel++)
5071 {
5072 enum elf_ppc_reloc_type r_type;
5073 bfd_vma offset;
5074 bfd_vma addend;
5075 bfd_reloc_status_type r;
5076 Elf_Internal_Sym *sym;
5077 asection *sec;
5078 struct elf_link_hash_entry *h;
5079 struct elf_link_hash_entry *fdh;
5080 const char *sym_name;
5081 unsigned long r_symndx;
5082 bfd_vma relocation;
5083 boolean unresolved_reloc;
5084 long insn;
5085 struct ppc_stub_hash_entry *stub_entry;
5086 bfd_vma max_br_offset;
5087 bfd_vma from;
5088
5089 r_type = (enum elf_ppc_reloc_type) ELF64_R_TYPE (rel->r_info);
5090 r_symndx = ELF64_R_SYM (rel->r_info);
5091 offset = rel->r_offset;
5092 addend = rel->r_addend;
5093 r = bfd_reloc_other;
5094 sym = (Elf_Internal_Sym *) 0;
5095 sec = (asection *) 0;
5096 h = (struct elf_link_hash_entry *) 0;
5097 sym_name = (const char *) 0;
5098 unresolved_reloc = false;
5099
5100 if (r_type == R_PPC64_TOC)
5101 {
5102 /* Relocation value is TOC base. Symbol is ignored. */
5103 relocation = TOCstart + TOC_BASE_OFF;
5104 }
5105 else if (r_symndx < symtab_hdr->sh_info)
5106 {
5107 /* It's a local symbol. */
5108 sym = local_syms + r_symndx;
5109 sec = local_sections[r_symndx];
5110 sym_name = "<local symbol>";
5111
5112 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
5113 /* rel may have changed, update our copy of addend. */
5114 addend = rel->r_addend;
5115 }
5116 else
5117 {
5118 /* It's a global symbol. */
5119 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
5120 while (h->root.type == bfd_link_hash_indirect
5121 || h->root.type == bfd_link_hash_warning)
5122 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5123 sym_name = h->root.root.string;
5124 relocation = 0;
5125 if (h->root.type == bfd_link_hash_defined
5126 || h->root.type == bfd_link_hash_defweak)
5127 {
5128 sec = h->root.u.def.section;
5129 if (sec->output_section == NULL)
5130 /* Set a flag that will be cleared later if we find a
5131 relocation value for this symbol. output_section
5132 is typically NULL for symbols satisfied by a shared
5133 library. */
5134 unresolved_reloc = true;
5135 else
5136 relocation = (h->root.u.def.value
5137 + sec->output_section->vma
5138 + sec->output_offset);
5139 }
5140 else if (h->root.type == bfd_link_hash_undefweak)
5141 ;
5142 else if (info->shared
5143 && (!info->symbolic || info->allow_shlib_undefined)
5144 && !info->no_undefined
5145 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
5146 ;
5147 else
5148 {
5149 if (! ((*info->callbacks->undefined_symbol)
5150 (info, h->root.root.string, input_bfd, input_section,
5151 offset, (!info->shared
5152 || info->no_undefined
5153 || ELF_ST_VISIBILITY (h->other)))))
5154 return false;
5155 }
5156 }
5157
5158 /* First handle relocations that tweak non-addend part of insn. */
5159 insn = 0;
5160 switch (r_type)
5161 {
5162 default:
5163 break;
5164
5165 /* Branch taken prediction relocations. */
5166 case R_PPC64_ADDR14_BRTAKEN:
5167 case R_PPC64_REL14_BRTAKEN:
5168 insn = 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */
5169 /* Fall thru. */
5170
5171 /* Branch not taken prediction relocations. */
5172 case R_PPC64_ADDR14_BRNTAKEN:
5173 case R_PPC64_REL14_BRNTAKEN:
5174 insn |= bfd_get_32 (output_bfd, contents + offset) & ~(0x01 << 21);
5175 if (is_power4)
5176 {
5177 /* Set 'a' bit. This is 0b00010 in BO field for branch
5178 on CR(BI) insns (BO == 001at or 011at), and 0b01000
5179 for branch on CTR insns (BO == 1a00t or 1a01t). */
5180 if ((insn & (0x14 << 21)) == (0x04 << 21))
5181 insn |= 0x02 << 21;
5182 else if ((insn & (0x14 << 21)) == (0x10 << 21))
5183 insn |= 0x08 << 21;
5184 else
5185 break;
5186 }
5187 else
5188 {
5189 from = (offset
5190 + input_section->output_offset
5191 + input_section->output_section->vma);
5192
5193 /* Invert 'y' bit if not the default. */
5194 if ((bfd_signed_vma) (relocation + addend - from) < 0)
5195 insn ^= 0x01 << 21;
5196 }
5197
5198 bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
5199 break;
5200
5201 case R_PPC64_REL24:
5202 /* A REL24 branching to a linkage function is followed by a
5203 nop. We replace the nop with a ld in order to restore
5204 the TOC base pointer. Only calls to shared objects need
5205 to alter the TOC base. These are recognized by their
5206 need for a PLT entry. */
5207 if (h != NULL
5208 && (fdh = ((struct ppc_link_hash_entry *) h)->oh) != NULL
5209 && fdh->plt.offset != (bfd_vma) -1
5210 && (stub_entry = ppc_get_stub_entry (input_section, sec, fdh,
5211 rel, htab)) != NULL)
5212 {
5213 boolean can_plt_call = 0;
5214
5215 if (offset + 8 <= input_section->_cooked_size)
5216 {
5217 insn = bfd_get_32 (input_bfd, contents + offset + 4);
5218 if (insn == NOP
5219 || insn == CROR_151515 || insn == CROR_313131)
5220 {
5221 bfd_put_32 (input_bfd, (bfd_vma) LD_R2_40R1,
5222 contents + offset + 4);
5223 can_plt_call = 1;
5224 }
5225 }
5226
5227 if (!can_plt_call)
5228 {
5229 /* If this is a plain branch rather than a branch
5230 and link, don't require a nop. */
5231 insn = bfd_get_32 (input_bfd, contents + offset);
5232 if ((insn & 1) == 0)
5233 can_plt_call = 1;
5234 }
5235
5236 if (can_plt_call)
5237 {
5238 relocation = (stub_entry->stub_offset
5239 + stub_entry->stub_sec->output_offset
5240 + stub_entry->stub_sec->output_section->vma);
5241 addend = 0;
5242 unresolved_reloc = false;
5243 }
5244 }
5245
5246 if (h != NULL
5247 && h->root.type == bfd_link_hash_undefweak
5248 && relocation == 0
5249 && addend == 0)
5250 {
5251 /* Tweak calls to undefined weak functions to point at a
5252 blr. We can thus call a weak function without first
5253 checking whether the function is defined. We have a
5254 blr at the end of .sfpr. */
5255 BFD_ASSERT (htab->sfpr->_raw_size != 0);
5256 relocation = (htab->sfpr->_raw_size - 4
5257 + htab->sfpr->output_offset
5258 + htab->sfpr->output_section->vma);
5259 from = (offset
5260 + input_section->output_offset
5261 + input_section->output_section->vma);
5262
5263 /* But let's not be silly about it. If the blr isn't in
5264 reach, just go to the next instruction. */
5265 if (relocation - from + (1 << 25) >= (1 << 26)
5266 || htab->sfpr->_raw_size == 0)
5267 relocation = from + 4;
5268 }
5269 break;
5270 }
5271
5272 /* Set `addend'. */
5273 switch (r_type)
5274 {
5275 default:
5276 (*_bfd_error_handler)
5277 (_("%s: unknown relocation type %d for symbol %s"),
5278 bfd_archive_filename (input_bfd), (int) r_type, sym_name);
5279
5280 bfd_set_error (bfd_error_bad_value);
5281 ret = false;
5282 continue;
5283
5284 case R_PPC64_NONE:
5285 case R_PPC_GNU_VTINHERIT:
5286 case R_PPC_GNU_VTENTRY:
5287 continue;
5288
5289 /* GOT16 relocations. Like an ADDR16 using the symbol's
5290 address in the GOT as relocation value instead of the
5291 symbols value itself. Also, create a GOT entry for the
5292 symbol and put the symbol value there. */
5293 case R_PPC64_GOT16:
5294 case R_PPC64_GOT16_LO:
5295 case R_PPC64_GOT16_HI:
5296 case R_PPC64_GOT16_HA:
5297 case R_PPC64_GOT16_DS:
5298 case R_PPC64_GOT16_LO_DS:
5299 {
5300 /* Relocation is to the entry for this symbol in the global
5301 offset table. */
5302 bfd_vma off;
5303
5304 if (htab->sgot == NULL)
5305 abort ();
5306
5307 if (h != NULL)
5308 {
5309 boolean dyn;
5310
5311 off = h->got.offset;
5312 dyn = htab->elf.dynamic_sections_created;
5313 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)
5314 || (info->shared
5315 && (info->symbolic
5316 || h->dynindx == -1
5317 || (h->elf_link_hash_flags
5318 & ELF_LINK_FORCED_LOCAL))
5319 && (h->elf_link_hash_flags
5320 & ELF_LINK_HASH_DEF_REGULAR)))
5321 {
5322 /* This is actually a static link, or it is a
5323 -Bsymbolic link and the symbol is defined
5324 locally, or the symbol was forced to be local
5325 because of a version file. We must initialize
5326 this entry in the global offset table. Since the
5327 offset must always be a multiple of 8, we use the
5328 least significant bit to record whether we have
5329 initialized it already.
5330
5331 When doing a dynamic link, we create a .rel.got
5332 relocation entry to initialize the value. This
5333 is done in the finish_dynamic_symbol routine. */
5334 if ((off & 1) != 0)
5335 off &= ~1;
5336 else
5337 {
5338 bfd_put_64 (output_bfd, relocation,
5339 htab->sgot->contents + off);
5340 h->got.offset |= 1;
5341 }
5342 }
5343 else
5344 unresolved_reloc = false;
5345 }
5346 else
5347 {
5348 if (local_got_offsets == NULL)
5349 abort ();
5350
5351 off = local_got_offsets[r_symndx];
5352
5353 /* The offset must always be a multiple of 8. We use
5354 the least significant bit to record whether we have
5355 already processed this entry. */
5356 if ((off & 1) != 0)
5357 off &= ~1;
5358 else
5359 {
5360 bfd_put_64 (output_bfd, relocation,
5361 htab->sgot->contents + off);
5362
5363 if (info->shared)
5364 {
5365 Elf_Internal_Rela outrel;
5366 Elf64_External_Rela *loc;
5367
5368 /* We need to generate a R_PPC64_RELATIVE reloc
5369 for the dynamic linker. */
5370 outrel.r_offset = (htab->sgot->output_section->vma
5371 + htab->sgot->output_offset
5372 + off);
5373 outrel.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE);
5374 outrel.r_addend = relocation;
5375 loc = (Elf64_External_Rela *) htab->srelgot->contents;
5376 loc += htab->srelgot->reloc_count++;
5377 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
5378 }
5379
5380 local_got_offsets[r_symndx] |= 1;
5381 }
5382 }
5383
5384 if (off >= (bfd_vma) -2)
5385 abort ();
5386
5387 relocation = htab->sgot->output_offset + off;
5388
5389 /* TOC base (r2) is TOC start plus 0x8000. */
5390 addend -= TOC_BASE_OFF;
5391 }
5392 break;
5393
5394 case R_PPC64_PLT16_HA:
5395 case R_PPC64_PLT16_HI:
5396 case R_PPC64_PLT16_LO:
5397 case R_PPC64_PLT32:
5398 case R_PPC64_PLT64:
5399 /* Relocation is to the entry for this symbol in the
5400 procedure linkage table. */
5401
5402 /* Resolve a PLT reloc against a local symbol directly,
5403 without using the procedure linkage table. */
5404 if (h == NULL)
5405 break;
5406
5407 if (h->plt.offset == (bfd_vma) -1
5408 || htab->splt == NULL)
5409 {
5410 /* We didn't make a PLT entry for this symbol. This
5411 happens when statically linking PIC code, or when
5412 using -Bsymbolic. */
5413 break;
5414 }
5415
5416 relocation = (htab->splt->output_section->vma
5417 + htab->splt->output_offset
5418 + h->plt.offset);
5419 unresolved_reloc = false;
5420 break;
5421
5422 /* TOC16 relocs. We want the offset relative to the TOC base,
5423 which is the address of the start of the TOC plus 0x8000.
5424 The TOC consists of sections .got, .toc, .tocbss, and .plt,
5425 in this order. */
5426 case R_PPC64_TOC16:
5427 case R_PPC64_TOC16_LO:
5428 case R_PPC64_TOC16_HI:
5429 case R_PPC64_TOC16_DS:
5430 case R_PPC64_TOC16_LO_DS:
5431 case R_PPC64_TOC16_HA:
5432 addend -= TOCstart + TOC_BASE_OFF;
5433 break;
5434
5435 /* Relocate against the beginning of the section. */
5436 case R_PPC64_SECTOFF:
5437 case R_PPC64_SECTOFF_LO:
5438 case R_PPC64_SECTOFF_HI:
5439 case R_PPC64_SECTOFF_DS:
5440 case R_PPC64_SECTOFF_LO_DS:
5441 case R_PPC64_SECTOFF_HA:
5442 if (sec != (asection *) 0)
5443 addend -= sec->output_section->vma;
5444 break;
5445
5446 case R_PPC64_REL14:
5447 case R_PPC64_REL14_BRNTAKEN:
5448 case R_PPC64_REL14_BRTAKEN:
5449 case R_PPC64_REL24:
5450 break;
5451
5452 /* Relocations that may need to be propagated if this is a
5453 dynamic object. */
5454 case R_PPC64_REL32:
5455 case R_PPC64_REL64:
5456 case R_PPC64_ADDR14:
5457 case R_PPC64_ADDR14_BRNTAKEN:
5458 case R_PPC64_ADDR14_BRTAKEN:
5459 case R_PPC64_ADDR16:
5460 case R_PPC64_ADDR16_DS:
5461 case R_PPC64_ADDR16_HA:
5462 case R_PPC64_ADDR16_HI:
5463 case R_PPC64_ADDR16_HIGHER:
5464 case R_PPC64_ADDR16_HIGHERA:
5465 case R_PPC64_ADDR16_HIGHEST:
5466 case R_PPC64_ADDR16_HIGHESTA:
5467 case R_PPC64_ADDR16_LO:
5468 case R_PPC64_ADDR16_LO_DS:
5469 case R_PPC64_ADDR24:
5470 case R_PPC64_ADDR30:
5471 case R_PPC64_ADDR32:
5472 case R_PPC64_ADDR64:
5473 case R_PPC64_UADDR16:
5474 case R_PPC64_UADDR32:
5475 case R_PPC64_UADDR64:
5476 /* r_symndx will be zero only for relocs against symbols
5477 from removed linkonce sections, or sections discarded by
5478 a linker script. */
5479 if (r_symndx == 0)
5480 break;
5481 /* Fall thru. */
5482
5483 case R_PPC64_TOC:
5484 if ((input_section->flags & SEC_ALLOC) == 0)
5485 break;
5486
5487 if (NO_OPD_RELOCS && is_opd)
5488 break;
5489
5490 if ((info->shared
5491 && (IS_ABSOLUTE_RELOC (r_type)
5492 || (h != NULL
5493 && h->dynindx != -1
5494 && (! info->symbolic
5495 || (h->elf_link_hash_flags
5496 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
5497 || (!info->shared
5498 && h != NULL
5499 && h->dynindx != -1
5500 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
5501 && (((h->elf_link_hash_flags
5502 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
5503 && (h->elf_link_hash_flags
5504 & ELF_LINK_HASH_DEF_REGULAR) == 0)
5505 || h->root.type == bfd_link_hash_undefweak
5506 || h->root.type == bfd_link_hash_undefined)))
5507 {
5508 Elf_Internal_Rela outrel;
5509 boolean skip, relocate;
5510 asection *sreloc;
5511 Elf64_External_Rela *loc;
5512
5513 /* When generating a dynamic object, these relocations
5514 are copied into the output file to be resolved at run
5515 time. */
5516
5517 skip = false;
5518 relocate = false;
5519
5520 outrel.r_offset =
5521 _bfd_elf_section_offset (output_bfd, info, input_section,
5522 rel->r_offset);
5523 if (outrel.r_offset == (bfd_vma) -1)
5524 skip = true;
5525 else if (outrel.r_offset == (bfd_vma) -2)
5526 skip = true, relocate = true;
5527 outrel.r_offset += (input_section->output_section->vma
5528 + input_section->output_offset);
5529 outrel.r_addend = addend;
5530
5531 if (skip)
5532 memset (&outrel, 0, sizeof outrel);
5533 else if (h != NULL
5534 && h->dynindx != -1
5535 && !is_opd
5536 && (!IS_ABSOLUTE_RELOC (r_type)
5537 || !info->shared
5538 || !info->symbolic
5539 || (h->elf_link_hash_flags
5540 & ELF_LINK_HASH_DEF_REGULAR) == 0))
5541 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
5542 else
5543 {
5544 /* This symbol is local, or marked to become local,
5545 or this is an opd section reloc which must point
5546 at a local function. */
5547 outrel.r_addend += relocation;
5548 relocate = true;
5549 if (r_type == R_PPC64_ADDR64 || r_type == R_PPC64_TOC)
5550 {
5551 outrel.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE);
5552 }
5553 else
5554 {
5555 long indx = 0;
5556
5557 if (bfd_is_abs_section (sec))
5558 ;
5559 else if (sec == NULL || sec->owner == NULL)
5560 {
5561 bfd_set_error (bfd_error_bad_value);
5562 return false;
5563 }
5564 else
5565 {
5566 asection *osec;
5567
5568 osec = sec->output_section;
5569 indx = elf_section_data (osec)->dynindx;
5570
5571 /* We are turning this relocation into one
5572 against a section symbol, so subtract out
5573 the output section's address but not the
5574 offset of the input section in the output
5575 section. */
5576 outrel.r_addend -= osec->vma;
5577 }
5578
5579 outrel.r_info = ELF64_R_INFO (indx, r_type);
5580 }
5581 }
5582
5583 sreloc = elf_section_data (input_section)->sreloc;
5584 if (sreloc == NULL)
5585 abort ();
5586
5587 loc = (Elf64_External_Rela *) sreloc->contents;
5588 loc += sreloc->reloc_count++;
5589 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
5590
5591 /* If this reloc is against an external symbol, it will
5592 be computed at runtime, so there's no need to do
5593 anything now. */
5594 if (! relocate)
5595 continue;
5596 }
5597 break;
5598
5599 case R_PPC64_COPY:
5600 case R_PPC64_GLOB_DAT:
5601 case R_PPC64_JMP_SLOT:
5602 case R_PPC64_RELATIVE:
5603 /* We shouldn't ever see these dynamic relocs in relocatable
5604 files. */
5605 /* Fall thru */
5606
5607 case R_PPC64_PLTGOT16:
5608 case R_PPC64_PLTGOT16_DS:
5609 case R_PPC64_PLTGOT16_HA:
5610 case R_PPC64_PLTGOT16_HI:
5611 case R_PPC64_PLTGOT16_LO:
5612 case R_PPC64_PLTGOT16_LO_DS:
5613 case R_PPC64_PLTREL32:
5614 case R_PPC64_PLTREL64:
5615 /* These ones haven't been implemented yet. */
5616
5617 (*_bfd_error_handler)
5618 (_("%s: Relocation %s is not supported for symbol %s."),
5619 bfd_archive_filename (input_bfd),
5620 ppc64_elf_howto_table[(int) r_type]->name, sym_name);
5621
5622 bfd_set_error (bfd_error_invalid_operation);
5623 ret = false;
5624 continue;
5625 }
5626
5627 /* Do any further special processing. */
5628 switch (r_type)
5629 {
5630 default:
5631 break;
5632
5633 case R_PPC64_ADDR16_HA:
5634 case R_PPC64_ADDR16_HIGHERA:
5635 case R_PPC64_ADDR16_HIGHESTA:
5636 case R_PPC64_PLT16_HA:
5637 case R_PPC64_TOC16_HA:
5638 case R_PPC64_SECTOFF_HA:
5639 /* It's just possible that this symbol is a weak symbol
5640 that's not actually defined anywhere. In that case,
5641 'sec' would be NULL, and we should leave the symbol
5642 alone (it will be set to zero elsewhere in the link). */
5643 if (sec != NULL)
5644 /* Add 0x10000 if sign bit in 0:15 is set. */
5645 addend += ((relocation + addend) & 0x8000) << 1;
5646 break;
5647
5648 case R_PPC64_ADDR16_DS:
5649 case R_PPC64_ADDR16_LO_DS:
5650 case R_PPC64_GOT16_DS:
5651 case R_PPC64_GOT16_LO_DS:
5652 case R_PPC64_PLT16_LO_DS:
5653 case R_PPC64_SECTOFF_DS:
5654 case R_PPC64_SECTOFF_LO_DS:
5655 case R_PPC64_TOC16_DS:
5656 case R_PPC64_TOC16_LO_DS:
5657 case R_PPC64_PLTGOT16_DS:
5658 case R_PPC64_PLTGOT16_LO_DS:
5659 if (((relocation + addend) & 3) != 0)
5660 {
5661 (*_bfd_error_handler)
5662 (_("%s: error: relocation %s not a multiple of 4"),
5663 bfd_archive_filename (input_bfd),
5664 ppc64_elf_howto_table[(int) r_type]->name);
5665 bfd_set_error (bfd_error_bad_value);
5666 ret = false;
5667 continue;
5668 }
5669 break;
5670
5671 case R_PPC64_REL14:
5672 case R_PPC64_REL14_BRNTAKEN:
5673 case R_PPC64_REL14_BRTAKEN:
5674 max_br_offset = 1 << 15;
5675 goto branch_check;
5676
5677 case R_PPC64_REL24:
5678 max_br_offset = 1 << 25;
5679
5680 branch_check:
5681 /* If the branch is out of reach, then redirect the
5682 call to the local stub for this function. */
5683 from = (offset
5684 + input_section->output_offset
5685 + input_section->output_section->vma);
5686 if (relocation + addend - from + max_br_offset >= 2 * max_br_offset
5687 && (stub_entry = ppc_get_stub_entry (input_section, sec, h,
5688 rel, htab)) != NULL)
5689 {
5690 /* Munge up the value and addend so that we call the stub
5691 rather than the procedure directly. */
5692 relocation = (stub_entry->stub_offset
5693 + stub_entry->stub_sec->output_offset
5694 + stub_entry->stub_sec->output_section->vma);
5695 addend = 0;
5696 }
5697 break;
5698 }
5699
5700 /* FIXME: Why do we allow debugging sections to escape this error?
5701 More importantly, why do we not emit dynamic relocs above in
5702 debugging sections (which are ! SEC_ALLOC)? If we had
5703 emitted the dynamic reloc, we could remove the fudge here. */
5704 if (unresolved_reloc
5705 && !(info->shared
5706 && (input_section->flags & SEC_DEBUGGING) != 0
5707 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
5708 (*_bfd_error_handler)
5709 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
5710 bfd_archive_filename (input_bfd),
5711 bfd_get_section_name (input_bfd, input_section),
5712 (long) rel->r_offset,
5713 h->root.root.string);
5714
5715 r = _bfd_final_link_relocate (ppc64_elf_howto_table[(int) r_type],
5716 input_bfd,
5717 input_section,
5718 contents,
5719 offset,
5720 relocation,
5721 addend);
5722
5723 if (r == bfd_reloc_ok)
5724 ;
5725 else if (r == bfd_reloc_overflow)
5726 {
5727 const char *name;
5728
5729 if (h != NULL)
5730 {
5731 if (h->root.type == bfd_link_hash_undefweak
5732 && ppc64_elf_howto_table[(int) r_type]->pc_relative)
5733 {
5734 /* Assume this is a call protected by other code that
5735 detects the symbol is undefined. If this is the case,
5736 we can safely ignore the overflow. If not, the
5737 program is hosed anyway, and a little warning isn't
5738 going to help. */
5739
5740 continue;
5741 }
5742
5743 name = h->root.root.string;
5744 }
5745 else
5746 {
5747 name = bfd_elf_string_from_elf_section (input_bfd,
5748 symtab_hdr->sh_link,
5749 sym->st_name);
5750 if (name == NULL)
5751 continue;
5752 if (*name == '\0')
5753 name = bfd_section_name (input_bfd, sec);
5754 }
5755
5756 if (! ((*info->callbacks->reloc_overflow)
5757 (info, name, ppc64_elf_howto_table[(int) r_type]->name,
5758 (bfd_vma) 0, input_bfd, input_section, offset)))
5759 return false;
5760 }
5761 else
5762 ret = false;
5763 }
5764
5765 return ret;
5766 }
5767
5768 /* Finish up dynamic symbol handling. We set the contents of various
5769 dynamic sections here. */
5770
5771 static boolean
5772 ppc64_elf_finish_dynamic_symbol (output_bfd, info, h, sym)
5773 bfd *output_bfd;
5774 struct bfd_link_info *info;
5775 struct elf_link_hash_entry *h;
5776 Elf_Internal_Sym *sym;
5777 {
5778 struct ppc_link_hash_table *htab;
5779 bfd *dynobj;
5780
5781 htab = ppc_hash_table (info);
5782 dynobj = htab->elf.dynobj;
5783
5784 if (h->plt.offset != (bfd_vma) -1
5785 && ((struct ppc_link_hash_entry *) h)->is_func_descriptor)
5786 {
5787 Elf_Internal_Rela rela;
5788 Elf64_External_Rela *loc;
5789
5790 /* This symbol has an entry in the procedure linkage table. Set
5791 it up. */
5792
5793 if (htab->splt == NULL
5794 || htab->srelplt == NULL
5795 || htab->sglink == NULL)
5796 abort ();
5797
5798 /* Create a JMP_SLOT reloc to inform the dynamic linker to
5799 fill in the PLT entry. */
5800
5801 rela.r_offset = (htab->splt->output_section->vma
5802 + htab->splt->output_offset
5803 + h->plt.offset);
5804 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_JMP_SLOT);
5805 rela.r_addend = 0;
5806
5807 loc = (Elf64_External_Rela *) htab->srelplt->contents;
5808 loc += (h->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE;
5809 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
5810 }
5811
5812 if (h->got.offset != (bfd_vma) -1)
5813 {
5814 Elf_Internal_Rela rela;
5815 Elf64_External_Rela *loc;
5816
5817 /* This symbol has an entry in the global offset table. Set it
5818 up. */
5819
5820 if (htab->sgot == NULL || htab->srelgot == NULL)
5821 abort ();
5822
5823 rela.r_offset = (htab->sgot->output_section->vma
5824 + htab->sgot->output_offset
5825 + (h->got.offset &~ (bfd_vma) 1));
5826
5827 /* If this is a static link, or it is a -Bsymbolic link and the
5828 symbol is defined locally or was forced to be local because
5829 of a version file, we just want to emit a RELATIVE reloc.
5830 The entry in the global offset table will already have been
5831 initialized in the relocate_section function. */
5832 if (info->shared
5833 && (info->symbolic
5834 || h->dynindx == -1
5835 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
5836 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
5837 {
5838 BFD_ASSERT((h->got.offset & 1) != 0);
5839 rela.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE);
5840 rela.r_addend = (h->root.u.def.value
5841 + h->root.u.def.section->output_section->vma
5842 + h->root.u.def.section->output_offset);
5843 }
5844 else
5845 {
5846 BFD_ASSERT ((h->got.offset & 1) == 0);
5847 bfd_put_64 (output_bfd, (bfd_vma) 0,
5848 htab->sgot->contents + h->got.offset);
5849 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_GLOB_DAT);
5850 rela.r_addend = 0;
5851 }
5852
5853 loc = (Elf64_External_Rela *) htab->srelgot->contents;
5854 loc += htab->srelgot->reloc_count++;
5855 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
5856 }
5857
5858 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
5859 {
5860 Elf_Internal_Rela rela;
5861 Elf64_External_Rela *loc;
5862
5863 /* This symbol needs a copy reloc. Set it up. */
5864
5865 if (h->dynindx == -1
5866 || (h->root.type != bfd_link_hash_defined
5867 && h->root.type != bfd_link_hash_defweak)
5868 || htab->srelbss == NULL)
5869 abort ();
5870
5871 rela.r_offset = (h->root.u.def.value
5872 + h->root.u.def.section->output_section->vma
5873 + h->root.u.def.section->output_offset);
5874 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_COPY);
5875 rela.r_addend = 0;
5876 loc = (Elf64_External_Rela *) htab->srelbss->contents;
5877 loc += htab->srelbss->reloc_count++;
5878 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
5879 }
5880
5881 /* Mark some specially defined symbols as absolute. */
5882 if (strcmp (h->root.root.string, "_DYNAMIC") == 0)
5883 sym->st_shndx = SHN_ABS;
5884
5885 return true;
5886 }
5887
5888 /* Used to decide how to sort relocs in an optimal manner for the
5889 dynamic linker, before writing them out. */
5890
5891 static enum elf_reloc_type_class
5892 ppc64_elf_reloc_type_class (rela)
5893 const Elf_Internal_Rela *rela;
5894 {
5895 enum elf_ppc_reloc_type r_type;
5896
5897 r_type = (enum elf_ppc_reloc_type) ELF64_R_TYPE (rela->r_info);
5898 switch (r_type)
5899 {
5900 case R_PPC64_RELATIVE:
5901 return reloc_class_relative;
5902 case R_PPC64_JMP_SLOT:
5903 return reloc_class_plt;
5904 case R_PPC64_COPY:
5905 return reloc_class_copy;
5906 default:
5907 return reloc_class_normal;
5908 }
5909 }
5910
5911 /* Finish up the dynamic sections. */
5912
5913 static boolean
5914 ppc64_elf_finish_dynamic_sections (output_bfd, info)
5915 bfd *output_bfd;
5916 struct bfd_link_info *info;
5917 {
5918 struct ppc_link_hash_table *htab;
5919 bfd *dynobj;
5920 asection *sdyn;
5921
5922 htab = ppc_hash_table (info);
5923 dynobj = htab->elf.dynobj;
5924 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
5925
5926 if (htab->elf.dynamic_sections_created)
5927 {
5928 Elf64_External_Dyn *dyncon, *dynconend;
5929
5930 if (sdyn == NULL || htab->sgot == NULL)
5931 abort ();
5932
5933 dyncon = (Elf64_External_Dyn *) sdyn->contents;
5934 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
5935 for (; dyncon < dynconend; dyncon++)
5936 {
5937 Elf_Internal_Dyn dyn;
5938 asection *s;
5939
5940 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
5941
5942 switch (dyn.d_tag)
5943 {
5944 default:
5945 continue;
5946
5947 case DT_PPC64_GLINK:
5948 dyn.d_un.d_ptr = (htab->sglink->output_section->vma
5949 + htab->sglink->output_offset);
5950 break;
5951
5952 case DT_PPC64_OPD:
5953 s = bfd_get_section_by_name (output_bfd, ".opd");
5954 if (s != NULL)
5955 dyn.d_un.d_ptr = s->vma;
5956 break;
5957
5958 case DT_PPC64_OPDSZ:
5959 s = bfd_get_section_by_name (output_bfd, ".opd");
5960 if (s != NULL)
5961 dyn.d_un.d_val = s->_raw_size;
5962 break;
5963
5964 case DT_PLTGOT:
5965 dyn.d_un.d_ptr = (htab->splt->output_section->vma
5966 + htab->splt->output_offset);
5967 break;
5968
5969 case DT_JMPREL:
5970 dyn.d_un.d_ptr = (htab->srelplt->output_section->vma
5971 + htab->srelplt->output_offset);
5972 break;
5973
5974 case DT_PLTRELSZ:
5975 dyn.d_un.d_val = htab->srelplt->_raw_size;
5976 break;
5977
5978 case DT_RELASZ:
5979 /* Don't count procedure linkage table relocs in the
5980 overall reloc count. */
5981 if (htab->srelplt != NULL)
5982 dyn.d_un.d_val -= htab->srelplt->_raw_size;
5983 break;
5984 }
5985
5986 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
5987 }
5988 }
5989
5990 if (htab->sgot != NULL && htab->sgot->_raw_size != 0)
5991 {
5992 /* Fill in the first entry in the global offset table.
5993 We use it to hold the link-time TOCbase. */
5994 bfd_put_64 (output_bfd,
5995 elf_gp (output_bfd) + TOC_BASE_OFF,
5996 htab->sgot->contents);
5997
5998 /* Set .got entry size. */
5999 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 8;
6000 }
6001
6002 if (htab->splt != NULL && htab->splt->_raw_size != 0)
6003 {
6004 /* Set .plt entry size. */
6005 elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize
6006 = PLT_ENTRY_SIZE;
6007 }
6008
6009 return true;
6010 }
6011
6012 #define TARGET_LITTLE_SYM bfd_elf64_powerpcle_vec
6013 #define TARGET_LITTLE_NAME "elf64-powerpcle"
6014 #define TARGET_BIG_SYM bfd_elf64_powerpc_vec
6015 #define TARGET_BIG_NAME "elf64-powerpc"
6016 #define ELF_ARCH bfd_arch_powerpc
6017 #define ELF_MACHINE_CODE EM_PPC64
6018 #define ELF_MAXPAGESIZE 0x10000
6019 #define elf_info_to_howto ppc64_elf_info_to_howto
6020
6021 #ifdef EM_CYGNUS_POWERPC
6022 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
6023 #endif
6024
6025 #ifdef EM_PPC_OLD
6026 #define ELF_MACHINE_ALT2 EM_PPC_OLD
6027 #endif
6028
6029 #define elf_backend_want_got_sym 0
6030 #define elf_backend_want_plt_sym 0
6031 #define elf_backend_plt_alignment 3
6032 #define elf_backend_plt_not_loaded 1
6033 #define elf_backend_got_symbol_offset 0
6034 #define elf_backend_got_header_size 8
6035 #define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE
6036 #define elf_backend_can_gc_sections 1
6037 #define elf_backend_can_refcount 1
6038 #define elf_backend_rela_normal 1
6039
6040 #define bfd_elf64_bfd_reloc_type_lookup ppc64_elf_reloc_type_lookup
6041 #define bfd_elf64_bfd_set_private_flags ppc64_elf_set_private_flags
6042 #define bfd_elf64_bfd_merge_private_bfd_data ppc64_elf_merge_private_bfd_data
6043 #define bfd_elf64_bfd_link_hash_table_create ppc64_elf_link_hash_table_create
6044 #define bfd_elf64_bfd_link_hash_table_free ppc64_elf_link_hash_table_free
6045
6046 #define elf_backend_section_from_shdr ppc64_elf_section_from_shdr
6047 #define elf_backend_create_dynamic_sections ppc64_elf_create_dynamic_sections
6048 #define elf_backend_copy_indirect_symbol ppc64_elf_copy_indirect_symbol
6049 #define elf_backend_check_relocs ppc64_elf_check_relocs
6050 #define elf_backend_gc_mark_hook ppc64_elf_gc_mark_hook
6051 #define elf_backend_gc_sweep_hook ppc64_elf_gc_sweep_hook
6052 #define elf_backend_adjust_dynamic_symbol ppc64_elf_adjust_dynamic_symbol
6053 #define elf_backend_hide_symbol ppc64_elf_hide_symbol
6054 #define elf_backend_always_size_sections ppc64_elf_func_desc_adjust
6055 #define elf_backend_size_dynamic_sections ppc64_elf_size_dynamic_sections
6056 #define elf_backend_fake_sections ppc64_elf_fake_sections
6057 #define elf_backend_relocate_section ppc64_elf_relocate_section
6058 #define elf_backend_finish_dynamic_symbol ppc64_elf_finish_dynamic_symbol
6059 #define elf_backend_reloc_type_class ppc64_elf_reloc_type_class
6060 #define elf_backend_finish_dynamic_sections ppc64_elf_finish_dynamic_sections
6061
6062 #include "elf64-target.h"
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